The Franklin Institute Logo
Case Files logo

Multi-motored Airplanes, 1933

Contents of CSA #2942

Case File of Igor Sikorsky
Committee on Science and the Arts
1933 Howard N. Potts Medal


  • Report [More Information]
  • Correspondence
    • Letter from Robert Kemp, to CSA, requesting information on the procedures for selecting a Franklin Medal recipient, 1/29/1930 (3.6M) | Page 2 (3.1M) [More Information]
    • Letter from CSA Secretary, to Robert Kemp, Explaining the procedure used in investigating and awarding honorary medals, 2/11/1930
    • Letter from N.N. Slovioff, to John Hay Whitney, Requesting completed service records for a Sikorsky aircraft, 12/11/1930
    • Letter from N.N. Slovioff, to The Broman Corporation, Requesting completed service records for a Sikorsky aircraft, 12/11/1930
    • Letter from C.T. Ramsey, to N.N. Slovioff, List of service records for Sikorsky airplanes operated by Pan American Airways, 12/18/1930 (and duplicate)
    • Letter from B.R. Whelan, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by The United Airports of Connecticut (copy), 12/18/1930
    • Letter from R.P. Junkin, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by Crosley Aircraft Company (copy), 12/18/1930
    • Letter from C.P.B. Roth, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by American International Airways (copy), 12/18/1930
    • Letter from C.J. Bennett, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by Public Service Company of Northern Illinois, 12/19/1930 (and duplicate)
    • Letter from E.E. Aldrin, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by Standard Oil Company of New Jersey (copy), 12/19/1930
    • Letter from John H. Jouett, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by Standard Oil Company of Louisiana, 12/22/1930 (and duplicate)
    • Letter from E.E. Aldrin, to N.N. Slovioff, Details of service record for Sikorsky airplane operated by Standard Oil Company of New Jersey, 12/23/1930
    • Letter from Stanley C. Kennedy, to Sikorsky Aviation Corporation, List of service records for Sikorsky airplanes operated by Inter-Island Airways Limited, 12/30/1930
    • (and duplicate)
    • Letter from James A. Walsh, to N.N. Slovioff, Details of service records for Sikorsky airplane operated by Colonial Airways Corporation (copy), 1/2/1931
    • Letter from Robert Kemp, to George A. Hoadley, Proposing Igor Sikorsky as a Franklin Medal recipient, with supporting information on his invention, 1/14/1931 (2.5M) | Page 2 (2.3M) [More Information]
    • Letter from CSA Secretary, to Robert Kemp, Appreciating the exhibits supplied in support of Sikorsky's application, 1/16/1931
    • Letter from CSA Secretary, to Robert Kemp, Informing that investigation will proceed and providing a blank application, 2/17/1931
    • Letter from Igor Sikorsky, to George A. Hoadley, Supplying operational data for Sikorsky airplanes in service, 3/13/1931
    • Letter from Robert Kemp, to George A. Hoadley, Appreciating committee's interest in Sikorsky's invention and the application blank supplied, 3/17/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Acknowledgement of receipt of application for investigation of the Sikorsky Flying Machine, 3/19/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Informing that the application for investigation of the Multi-Motored Flying Machine has been accepted, 4/10/1931
    • Letter from CSA Secretary, to Lionel F. Levy, Detailing qualifications of suitable candidates for CSA Sub-Committee membership, 4/20/1931
    • Letter from CSA Secretary, to W. Laurence Saunders, Notifying of appointment to the Sub-Committee to investigate the Sikorsky Multi-Motored Flying Machine, 4/30/1931
    • Letter from CSA Secretary, to Stephen H. Noyes, Notifying of appointment to the Sub-Committee to investigate the Sikorsky Multi-Motored Flying Machine, 4/30/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Notifying of appointment to the Sub-Committee to investigate the Sikorsky Multi-Motored Flying Machine, 4/30/1931
    • Letter from CSA Secretary, to James Barnes, Notifying of appointment to the Sub-Committee to investigate the Sikorsky Multi-Motored Flying Machine, 4/30/1931
    • Letter from CSA Secretary, to Henry B. Allen, Notifying of appointment to the Sub-Committee to investigate the Sikorsky Multi-Motored Flying Machine, 4/30/1931
    • Postcard from Stephen H. Noyes, Accepting membership of the CSA sub-committee on Application No. 2942, 5/1/1931
    • Letter from John H. Witherow, to George A. Hoadley, Informing that Laurence Saunders will receive the invitation on his return from Europe, 5/2/1931
    • Postcard from James Barnes, Accepting membership of the CSA sub-committee on Application No. 2942, 5/4/1931
    • Letter from Samuel B. Eckert, to George A. Hoadley, Accepting membership of the CSA sub-committee on Application No. 2942, 5/5/1931
    • CSA Secretary Letter, to Samuel B. Eckert, Expressing appreciation for Eckert's acceptance of sub-committee membership, 5/6/1931
    • Postcard from W. Laurence Saunders, Accepting membership of the CSA sub-committee on Application No. 2942, 5/15/1931
    • Letter from CSA Secretary, to Henry B. Allen, Reminder requesting a reply to the invitation to join the CSA sub-committee on Application No. 2942, 5/22/1931
    • Postcard from Henry B. Allen, Accepting chairmanship of the CSA sub-committee on Application No. 2942, 5/23/1931 (770K) [More Information]
    • Letter from CSA Secretary, to Henry B. Allen, Enclosing preliminary information on the Sikorsky Amphibian airplane, 5/26/1931
    • Letter from CSA Secretary, to W. Laurence Saunders, Enclosing information on hand at the Franklin Institute concerning the Sikorsky Multi-Motored Airplane, 6/2/1931
    • Letter from CSA Secretary, to James Barnes, Enclosing information on hand at the Franklin Institute concerning the Sikorsky Multi-Motored Airplane, 6/2/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Enclosing information on hand at the Franklin Institute concerning the Sikorsky Multi-Motored Airplane, 6/2/1931
    • Letter from CSA Secretary, to Henry B. Allen, Enclosing information on hand at the Franklin Institute concerning the Sikorsky Multi-Motored Airplane, 6/2/1931
    • Letter from John H. Witherow, to George A. Hoadley, Informing that appointment conflicts prevent attendance at the sub-committee meeting, 6/8/1931
    • Letter from CSA Secretary, to Stephen H. Noyes, Requesting rescheduling of the upcoming sub-committee meeting, 6/8/1931
    • Letter from CSA Secretary, to W. Laurence Saunders, Requesting rescheduling of the upcoming sub-committee meeting, 6/8/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Requesting rescheduling of the upcoming sub-committee meeting, 6/8/1931
    • Letter from CSA Secretary, to James Barnes, Requesting rescheduling of the upcoming sub-committee meeting, 6/8/1931
    • Letter from John H. Witherow, to George A. Hoadley, Informing that Lawrence Saunders will be unable to attend the sub-committee meeting, 6/17/1931
    • Letter from S.B. Eckert, to George A. Hoadley, Supplying military contact names for Sikorsky inquiries, 6/26/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Acknowledging receipt of military contacts information
    • Letter from CSA Secretary, to Clinton W. Howard, Requesting an opinion on the significance of the Sikorsky Multi-Motored Airplane, 7/1/1931
    • Letter from CSA Secretary, to W.W. Webster, Requesting an opinion on the significance of the Sikorsky Multi-Motored Airplane, 7/1/1931
    • Letter from CSA Secretary, to D.M. Sheaffer, Requesting an opinion on the significance of the Sikorsky Multi-Motored Airplane, 7/1/1931
    • Letter from CSA Secretary, to T.E. Tillinghast, Requesting an opinion on the significance of the Sikorsky Multi-Motored Airplane, 7/1/1931
    • Letter from CSA Secretary, to Ralph D. Weyerbacher, Requesting an opinion on the significance of the Sikorsky Multi-Motored Airplane, 7/1/1931
    • Letter from W.W. Webster, to George A. Hoadley, Refusing to provide information, inappropriate as a government official, 7/6/1931
    • Letter from D.M. Sheaffer, to Charles Lindbergh, Explaining the circumstances of The Franklin Institute's inquiries on the Sikorsky device and requesting information, 7/7/1931 (2.4M) | Page 2 (1.7M) [More Information]
    • Letter from D.M. Sheaffer, to George A. Hoadley, Enclosing a copy of the request forwarded to Lindbergh, 7/7/1931
    • Letter from CSA Secretary, to D.M. Sheaffer, Expressing deep thanks for cooperation in obtaining information from Colonel Lindbergh, 7/8/1931
    • Letter from CSA Secretary, to W.W. Webster, Expressing thanks for information supplied, 7/9/1931
    • Letter from C.W. Howard, to George A. Hoadley, Supplying comparative data on the Sikorsky C-6A/S-38 and another unnamed amphibian airplane, 7/9/1931 (2.9M) | Page 2 (3.2M) [More Information]
    • Letter from CSA Secretary, to C.W. Howard, Expressing appreciation for comparative data on Sikorsky and other amphibian planes, 7/13/1931
    • Letter from Charles A. Lindbergh, to Daniel Sheaffer, Commenting on the usefulness of the Sikorsky automatic fin compensation in Sikorsky-built airplanes, 7/13/1931 (2.6M) [More Information]
    • Letter from Daniel Sheaffer, to George A. Hoadley, Enclosing a copy of Colonel Lindbergh's letter concerning the Sikorsky safety device, 7/14/1931 (2.2M) [More Information]
    • Letter from CSA Secretary, to D.M. Sheaffer, Acknowledging receipt of copy of Lindbergh letter concerning the Sikorsky automatic fin compensation, 7/15/1931
    • Letter from T.E. Tillinghast, to George A. Hoadley, Stating a lack of qualification to provide an opinion on the Sikorsky Multi-motored Amphibian, 7/28/1931
    • Letter from CSA Secretary, to T.E. Tillinghast, Adding details to previous request for information, 7/29/1931
    • Letter from R.D. Weyerbacher, to George A. Hoadley, Stating general appreciation for Sikorsky airplanes, 7/30/1931
    • Letter from T.E. Tillinghast, to George A. Hoadley, Informing of transfer of inquiry to C.H. Chatfield, 8/4/1931
    • Letter from CSA Secretary, to T.E. Tillinghast, Noting the transfer of the inquiry to C.H. Chatfield, 8/11/1931
    • Letter from Charles H. Chatfield, to George A. Hoadley, Promising further information later and pointing to connection between United Aircraft and Sikorsky Aviation Corp, 8/11/1931 (2.9M) [More Information]
    • Letter from CSA Secretary, to Ralph D. Weyerbacher, Acknowledging with thanks information on the Sikorsky airplanes, 8/11/1931
    • Letter from Charles H. Chatfield, to George A. Hoadley, Informing of the unique usefulness of the Sikorsky automatic control device, 8/18/1931 (3.3M) [More Information]
    • Letter from CSA Secretary, to Charles H. Chatfield, Acknowledging with thanks information on the Sikorsky control device, 8/20/1931
    • Letter from George A. Hoadley, to Harold F. Pitcairn, Requesting information on experience with the Sikorsky automatic control device, 8/24/1931
    • Letter from George A. Hoadley, to C.T. Ludington, Requesting information on experience with the Sikorsky automatic control device, 8/24/1931
    • Letter from George A. Hoadley, to Stanley C. Kennedy, Requesting information on experience with the Sikorsky automatic control device, 8/24/1931
    • Letter from George A. Hoadley, to C.T. Ramsay, Requesting information on experience with the Sikorsky automatic control device, 8/24/1931
    • Letter from George A. Hoadley, to James A. Walsh, Requesting information on experience with the Sikorsky automatic control device, 8/24/1931
    • Letter from Harold F. Pitcairn, to George A. Hoadley, Expressing no knowledge of the Sikorsky improvement, 8/27/1931
    • Letter from CSA Secretary, to Harold F. Pitcairn, Acknowledging information on non-experience with the device, 8/31/1931
    • Letter from George A. Hoadley, to W. Sanger Green, Advising of the use of adjustable stabilizers on non-Stinson motors and availability of an automatic pilot from Guardian Aerial Corp, 9/1/1931
    • Letter from W. Sanger Green, to George A. Hoadley, Annotated copy of Hoadley letter stating Guardian Aerial device is not being used by American Airlines, 9/2/1931
    • Letter from CSA Secretary, to W. Sanger Green, Acknowledging receipt of information on the availability of the Guardian Aerial control device, 9/2/1931
    • Letter from Ray D. Wonsey, to George A. Hoadley, Attaching letter indicating American Airways has no experience with the automatic control device, 9/3/1931
    • Letter from Stanley C. Kennedy, to George A. Hoadley, Detailing accident experiences and automatic control effectiveness while flying the Sikorsky amphibian in Hawaii, 9/4/1931 (2.1M) | Page 2 (2.2M) [More Information]
    • Letter from Charlie N. James, to George A. Hoadley, Detailing experience with using a Sikorsky amphibian airplane, 9/8/1931 (2.1M) [More Information]
    • Letter from CSA Secretary, to Charlie N. James, Acknowledging, with thanks, information received on Sikorsky amphibian piloting experience, 9/16/1931
    • Letter from CSA Secretary, to Stanley C. Kennedy, Supplying previously omitted details of Sikorsky's control device patent, 9/22/1931
    • Letter from C.T. Ramsay, to George A. Hoadley, Requesting additional information on the Sikorsky patent for the control device, 9/24/1931 (3.1M) [More Information]
    • Letter from CSA Secretary, to C.T. Ramsay, Supplying previously omitted details of Sikorsky's control device patent, 9/24/1931
    • Letter from CSA Secretary, to Henry B. Allen, Informing of three letter received from Lindbergh, Chatfield, and Kennedy with information on the control device, 10/19/1931
    • Letter from CSA Secretary, to James Barnes, Enclosing letters concerning the usefulness of the control device and stressing the need for an early committee meeting, 10/20/1931
    • Letter from CSA Secretary, to W. Laurence Saunders, Enclosing letters concerning the usefulness of the control device and stressing the need for an early committee meeting, 10/20/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Enclosing letters concerning the usefulness of the control device and stressing the need for an early committee meeting, 10/20/1931
    • Letter from Samuel B. Eckert, to George A. Hoadley, Giving the opinion that the invention may be too specialized for award recognition, 10/22/1931
    • Letter from Samuel B. Eckert, to George A. Hoadley, Detailing opinions on the usefulness of the automatic control device, 10/30/1931
    • Letter from CSA Secretary, to Samuel B. Eckert, Acknowledging information received and advising of delay in further action, 10/31/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Requesting further details on control device operation, 10/31/1931
    • Letter from Igor Sikorsky, to George A. Hoadley, Expressing willingness to supply further information on the control device, 11/3/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Asking for information on the flight Lindbergh will make in the Sikorsky airplane, 11/12/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Asking for references to experienced users of the automatic control device, 11/12/1931
    • Letter from Igor Sikorsky, to George A. Hoadley, Supplying references to contact for information on the value of the automatic control device, 11/14/1931 (2.1M) | Page 2 (1.2M) [More Information]
    • Letter from CSA Secretary, to Henry White, Requesting an opinion on the usefulness of the Sikorsky Control Device, 11/17/1931
    • Letter from CSA Secretary, to E.P. Schultz, Requesting an opinion on the usefulness of the Sikorsky Control Device, 11/17/1931
    • Letter from CSA Secretary, to Igor Sikorsky, Acknowledging information on references supplied by automatic control device users, 11/17/1931
    • Letter from Henry White, to George A. Hoadley, Detailing the operation of the automatic control device and its incalculable usefulness in airplane operation, 11/19/1931 (3.3M) | Page 2 (3.2M) [More Information]
    • Letter from CSA Secretary, to Henry B. Allen, Enclosing letters concerning the usefulness of the control device and stressing the need for an early committee meeting, 11/21/1931
    • Letter from CSA Secretary, to R.O.D. Sullivan, Requesting Pan American's opinion on the usefulness of the Sikorsky Control Device, 11/24/1931
    • Letter from CSA Secretary, to Henry B. Allen, Advising of the Newark location of a Sikorsky S-38 available for examination, 11/26/1931
    • Letter from CSA Secretary, to Henry B. Allen, Offering to schedule a Sub-Committee meeting to advance the report on the Sikorsky Control Device, 12/11/1931
    • Letter from CSA Secretary, to Henry B. Allen, Requesting a meeting date to propose a first reading of case file report No. 2942, 1/8/1932
    • Letter from CSA Secretary, to Igor Sikorsky, Requesting details of any incident in which the automatic control device avoided an airplane accident, 1/21/1932
    • Letter from CSA Secretary, to Henry B. Allen, Requesting suitable dates for scheduling a Sub-Committee meeting, 2/24/1932
    • Letter from CSA Secretary, to Samuel B. Eckert, Requesting suitable dates for scheduling a Sub-Committee meeting, 3/24/1932
    • Letter from Henry B. Allen, to George A. Hoadley, Enclosing a draft copy of case report No. 2942, 4/6/1932
    • Letter from CSA Secretary, to CSA Sub-Committee, Requesting review of the Sikorsky case report No. 2942, lacking recommendation wording, 4/8/1932
    • Letter from CSA Secretary, to Henry B. Allen, Requesting wording for the citation accompanying the award, 4/19/1932
    • Letter from CSA Secretary, to Henry B. Allen, Suggesting possible final wording of the Sikorsky report on the Automated Control Device for airplanes, 4/27/1932
    • Letter from Henry B. Allen, to George A. Hoadley, Promising to meet and discuss the status of the Sikorsky case report No. 2942, 5/1/1932
    • Letter from Robert Kemp, to George A. Hoadley, Inquiring about the status of the investigation into Sikorsky's fitness as a medal awardee, 5/3/1932
    • Letter from CSA Secretary, to CSA Sub-Committee, Requesting a decision on the amended Sub-Committee report attached, 5/7/1932
    • Letter from James Barnes, to George A. Hoadley, Concurring with the award of a certificate of merit for a device, 5/9/1932
    • Letter from CSA Secretary, to Robert Kemp, Informing of the Sub-Committee's attention to Sikorsky's patented Automatic Control for a Multi-Motored Flying Machine, 5/9/1932
    • Letter from CSA Secretary, to Henry B. Allen, Suggesting consideration of airplane invention in addition to automatic control in the award recommendation, 6/9/1932
    • Letter from Robert Kemp, to George A. Hoadley, Inquiring about progress in Case No. 2942, 7/14/1932
    • Letter from CSA Secretary, to Robert Kemp, Providing an update on the Sub-Committee's progress, 7/20/1932
    • Letter from CSA Secretary, to Henry B. Allen, Informing the Sub-Committee that the Sikorsky application goes beyond the patented direction controller into the entire airplane, 8/1/1932
    • Letter from CSA Secretary, to Henry B. Allen, Reminding that action on the sub-committee is imminently required, 9/7/1932
    • Letter from CSA Secretary, to C.G. Abbot, Asking the Smithsonian Institution for information on flying machine inventors, 9/13/1932
    • Letter from CSA Secretary, to Robert Kemp, Requesting direct proof that Sikorsky is the inventor of the original multi-motored airplane, 9/13/1932
    • Letter from Robert Kemp, to George A. Hoadley, Supplying details to reinforce Sikorsky's achievement as the inventor of the multi-motored airplane, 9/16/1932 (and two duplicate copies), 9/16/1932 (2.8M) | Page 2 (2.8M) | Page 3 (1.9M) [More Information]
    • Letter from Robert Kemp, to George A. Hoadley, Enclosing Howard Mingos' affidavit regarding the Sikorsky award discussion, 9/19/1932
    • Letter from CSA Secretary, to Samuel B. Eckert, Reporting that sub-committee scope may be extended to cover Sikorsky's multi-motored airplane invention and requesting opinions, 9/21/1932 (4.2M) | Page 2 (4.0M) [More Information]
    • Letter from CSA Secretary, to Henry B. Allen, Enclosing a copy of Mingos' affidavit, 9/21/1932
    • Letter from CSA Secretary, to Robert Kemp, Thanking for valuable information supplied and the Mingos affidavit, 9/21/1932
    • Letter from Robert Kemp, to George A. Hoadley, Detailing items which support Sikorsky as the inventor of the world's first multi-motored airplane, 9/29/1932 (3.3M) [More Information]
    • Letter from J.M. Graf, to George A. Hoadley, Supplying a summary of multi-motored flying machines invented, 10/1/1932 (3.2M) [More Information]
    • Letter from CSA Secretary, to J.E. Graf, Thanking the Smithsonian for information supplied, 10/5/1932
    • Letter from CSA Secretary, to Robert Kemp, Assuring that Sikorsky material was received, 10/11/1932
    • Letter from CSA Secretary, to Henry B. Allen, Reporting on information supplied and suggesting a face-to-face sub-Committee meeting, 10/25/1932
    • Letter from Samuel B. Eckert, to George A. Hoadley, Enclosing a copy of the letter to Col. Playfair, 11/16/1932
    • Letter to P.H.L. Playfair, Requesting information on British airplanes invented before Sikorsky's efforts, 11/16/1932
    • Letter from CSA Secretary, to Henry B. Allen, Informing that British Air Force has been contacted for information, 11/17/1932
    • Letter from CSA Secretary, to Samuel B. Eckert, Thanking for copy of letter to British Air Force, 11/17/1932
    • Letter from CSA Secretary, to Henry B. Allen, Drawing attention to information on Sikorsky airplanes, 11/23/1932
    • Letter from J.S. Buchanan, to P.H.L. Playfair, Supplying details of multi-engine airplanes flown in England in 1912, 12/10/1932 (2.7M) [More Information]
    • Letter from Samuel B. Eckert, to George A. Hoadley, Informing that Col. Playfair will find and return requested information, 12/13/1932
    • Letter from P.H.L. Playfair, to Samuel B. Eckert, Supplying requested information and references for further questions, 12/13/1932
    • Letter from CSA Secretary, to Samuel B. Eckert, Anticipating receipt of further technical information, 12/16/1932
    • Letter from Joseph S. Ames, to Howard McClenahan, Advising that the Elliot patent is not available and giving the opinion that Sikorsky's was the first successful
    • multi-engined airplane, 12/22/1932
    • Letter from Samuel B. Eckert, to George A. Hoadley, Enclosing letter from Col. Playfair with irrelevant information, 12/24/1932
    • Letter from CSA Secretary, to Henry B. Allen, Forwarding and requesting comment on enclosed letters from Mr. Eckert, 12/27/1932
    • Letter from CSA Secretary, to Samuel B. Eckert, Advising that letters from Buchanan and Playfair have been sent to the Sikorsky Sub-Committee, 12/27/1932
    • Letter from Howard McClenahan, to Henry Butler Allen, Enclosing a technical memorandum from the National Advisory Committee for Aeronautics, 12/29/1932
    • Letter from CSA Secretary, to Dr. Ames, Acknowledging and thanking for receipt of technical memorandum, "The Cells of Giant Airplanes!!" 12/29/1932
    • Letter from CSA Secretary, to Igor Sikorsky, Requesting information on the use and ownership of the Multi-Motored Airplane, 12/30/1932
    • Letter from CSA Secretary, to Pan American Airways, Requesting information on the selection of the Sikorsky airplane for service to South America, 12/31/1932
    • Letter from CSA Secretary, to Robert Kemp, Requesting information on the naming system used for amphibian aircraft, 1/4/1933
    • Letter from Igor Sikorsky, to George A. Hoadley, Supplying details on multi-motored airplanes manufactured and anticipated, 1/5/1933 (2.2M) [More Information]
    • Letter from CSA Secretary, to Robert Kemp, Requesting detailed data on Sikorsky multi-motored planes in operation, 1/6/1933
    • Letter from Robert Kemp, to George A. Hoadley, Supplying information on Sikorsky airplane production in Russia and the U.S. with comments on the availability of further data, 1/9/1933 (3.8M) | Page 2 (3.4M) [More Information]
    • Letter from CSA Secretary, to Robert Kemp, Informing that the necessary information had been received from Sikorsky, 1/9/1933
    • Letter from CSA Secretary, to Igor Sikorsky, Sending thanks for the swift supply of requested information, 1/9/1933
    • Letter from Samuel B. Eckert, to George A. Hoadley, Listing the basic reasons for awarding the Potts Medal to Sikorsky, 1/10/1933 (and duplicate)
    • Letter from CSA Secretary, to Robert Kemp, Thanking for information concerning Lindbergh's route in Pan American inaugural flight, 1/13/1933
    • Letter from CSA Secretary, to Samuel B. Eckert, Acknowledging suggestions and requesting approval of their incorporation in the attached medal recommendation text, 1/16/1933
    • Letter from Samuel B. Eckert, to George A. Hoadley, Approving suggestions for paragraph contents in Potts Medal recommendation, 1/17/1933
    • Letter from CSA Secretary, to Henry Butler Allen, Requesting suitable dates to reschedule sub-committee meeting, 1/19/1933
    • Letter from CSA Secretary, to Robert Kemp, Requesting details of Lindbergh's inaugural route with Pan-American Airways, 1/21/1933
    • Letter from Robert Kemp, to George A. Hoadley, Supplying NY Times reference sources for details of Lindbergh's inaugural Pan-American flight to Christobel, 1/26/1933
    • Letter from CSA Secretary, to Henry B. Allen, Enclosing report copy with requested modifications, 1/27/1933
    • Letter from CSA Secretary, to W. Laurence Saunders, Requesting a review of the final report and a quick response, 1/27/1933
    • Letter from CSA Secretary, to Samuel B. Eckert, Requesting a review of the final report and a quick response, 1/27/1933
    • Letter from CSA Secretary, to James Barnes, Requesting a review of the final report and a quick response, 1/27/1933
    • Letter from W. Saunders, to George A. Hoadley, Approving the CSA sub-committee report, 1/30/1933
    • Letter from Robert Kemp, to George A. Hoadley, Detailing flights made by Colonel Lindbergh for Pan-American, introducing and inaugurating mail flights to South America, 2/1/1933 (3.9M) [More Information]
    • Letter from CSA Secretary, to William F. Jackson, Requesting advertisement of the award, with stated citation, in the Journal of the Institute, 2/8/1933
    • Letter from CSA Secretary, to Robert Kemp, Acknowledging receipt of reply concerning path finding flights from the United States to South America, 2/9/1933
    • Letter from CSA Secretary, to Igor Sikorsky, Informing Sikorsky of the unanimous decision to award him the Potts Medal, 2/17/1933
    • Letter from Igor Sikorsky, to Howard McClenahan, Appreciating the honor of the award and promising to attend the presentation, 2/21/1933
    • Letter from CSA Secretary, to Igor Sikorsky, Informing that the Potts Medal will be awarded since absolutely no objections were received, 4/27/1933
    • Letter from Igor Sikorsky, to Howard McClenahan, Asking if ladies are invited to award proceedings, 5/2/1933
    • Letter from CSA Secretary, to Igor Sikorsky, Responding to Sikorsky's question. Women, Mrs. Sikorsky included, are not invited to celebration dinner, 5/8/1933
    • Letter from Howard McClenahan, to Henry Butler Allen, Asking addressee to sponsor Sikorsky at award proceedings, Allen's handwritten acceptance included, 5/10/1933
    • Letter from CSA Secretary, to Henry Butler Allen, Asking addressee to sponsor Sikorsky at award proceedings, 5/10/1933
    • Letter from CSA Secretary, to Igor Sikorsky, Providing directions for arrival at the award ceremony, 5/10/1933
    • Letter to Henry Butler Allen, Enclosing text to use in introducing the medalist at the award exercises, 5/16/1933
  • Evidential Information
    • Publications
      • Newspaper, Sikorsky Aviation Corp., Pictorial History of Sikorsky airplanes, 4/13/1905
      • Newsletter, Sikorsky Aviation Corp., Newsletter describing company aims and happenings, February 1930
      • Newspaper, Wall Street Journal, Describing financial status of Pan American parent, Aviation Corp. of America, 1/16/1931 (and duplicate)
      • Newspaper, Press clippings concerning the uses of Sikorsky amphibian airplanes, 11/16/1931 (1.5M) [More Information]
      • Press clippings concerning the uses of Sikorsky amphibian airplanes, January 1933 (1.2M) | Another clipping (697K) [More Information]
      • Article describing the history of Sikorsky's inventions, undated
      • The H.K. McCann Company advertisement, Collection of advertising copy prepared for Sikorsky Aviation
    • Patents
      • French Patent No. 451,312 on Stabilization and Direction Control of aeroplanes granted to Ateliers D'Aviation Louise Breguet, 3/2/1914
      • U.S. Patent No. 1,353,544 on Improvements in Twin-Propeller Aeroplanes granted to Lawrence B. Sperry, 9/21/1920
      • U.S. Patent No. 1,375,421 on Improvements in Tail-Planes granted to Hubert Scott-Paine, 4/19/1921
      • U.S. Patent No. 1,560,869 on Improvements in Flying Machines granted to Igor I. Sikorsky, 11/10/1925 (3 duplicate copies) (3.5M) | Page 2 (4.0M) | Page 3 (4.3M) | Page 4 (4.4M) | Page 5 (3.6M) [More Information]
  • Ephemera
  • Miscellaneous
    • Minutes from George A. Hoadley, to the Committee on Science and the Arts, Recommending investigation as to comparison of the Sikorsky machine with others available, 6/19/1931
    • Minutes from George A. Hoadley, to the Committee on Science and the Arts, Agreeing to further investigate the narrow application of the automatic control device, 11/30/1931
    • Affidavit from Howard Mingos, Affirming that Sikorsky is generally conceded to be the inventor of the first successful multi-motored airplane ever flown (and duplicate), 9/19/1932 (2.7M) [More Information]
    • Minutes from George A. Hoadley, to the Committee on Science and the Arts, Agreeing to investigate the expansion of Sikorsky's award from the narrow topic of the control device to lifetime achievements in aeronautics, 11/4/1932
    • Minutes from George A. Hoadley, to the Committee on Science and the Arts, Agreeing that the Potts Medal award citation be expanded from the automatic control device to Sikorsky's lifetime contributions to the aeronautical art, 1/9/1933
    • Memorandum to Mr. Jackson, Informing of the citation to be used for the award certificate, 4/6/1933
    • Memorandum to Howard McClenahan, Noting that Sikorsky should be informed of no objections to his award, 4/18/1933
    • Certificate awarding the Howard N. Potts Medal to Sikorsky for development of Multi-Motored Airplanes (photocopy), 5/17/1933 (2.5M) [More Information]
    • Notice of Intention from Howard McClenahan, Notice of intention to award the Potts Medal to Igor Sikorsky, March 1933
    • Memorandum to Mr. Jackson, Informing of the engraving to be used for the Potts medal, undated
    • Postcard from Samuel B. Eckert, Accepting membership of the CSA sub-committee on Application No. 2942, undated
    • Summary of Sikorsky's contributions to aviation, undated (3.0M) | Page 2 (2.4M) [More Information]
    • Summary of U.S. Patent No. 1,560,869, Igor Sikorsky, undated (and duplicate)
    • Brief statement of Sikorsky invention, undated