Committee on Science and the Arts
Case File of Elmer Ambrose Sperry
Contents of CSA #2710
- Report
- CSA Report: Case No. 2710, The Sperry High-Intensity Searchlight, description of the underlying science and operation of the High Intensity Searchlight, 3/12/1918
- CSA Report: Case No. 2710, The Sperry High-Intensity Searchlight (duplicate copy), 3/12/1918
- Hoadley Report: To W.C.L. Eglin, status report indicating the Sperry Searchlight investigation is in the hands of the Subcommittee, 4/25/1918
- Hoadley Report: To W.C.L. Eglin, status report indicating the Sperry Searchlight investigation is in the hands of the Subcommittee, 5/28/1918
- Hoadley Report: To W.C.L. Eglin, status report indicating the Sperry Searchlight investigation is in the hands of the Subcommittee, 1/3/1919
- R.B. Owens Report: To W.C.L. Eglin, status report indicating the Sperry Searchlight investigation is in the hands of the Subcommittee, 1/30/1919
- R.B. Owens Report: To W.C.L. Eglin, status report indicating the Sperry Searchlight investigation is deferred pending operational examination, 3/27/1919
- Correspondence
- CSA Secretary Letter: To Sperry, invitation to submit the High Intensity Searchlight for investigation by the Subcommittee, 10/4/1917
- Sperry Letter: To G.A. Hoadley, acknowledgement of receipt of the Franklin Institute 1915 yearbook, 10/6/1917
- Hoadley Memo: Informal information on the illumination properties of the Sperry searchlight, 10/8/1917
- Sperry Letter: To The Franklin Institute, agreement to Subcommittee's inspection of the searchlight, 10/16/1917
- Hoadley Letter: To Sperry, acknowledgement of inquiry and enclosure of Application for Investigation by the CSA committee, 10/17/1917
- CSA Secretary Letter: To Sperry, informing of subcommittee's decision to defer examination until after the war, 11/9/1917
- Sperry Letter: To Hoadley, acceptance that the examination has been tabled, suggesting future reference will be made, 11/12/1917
- CSA Assistant Letter: To Sperry, notification that the application for investigation of the Sperry Searchlight was accepted, 12/13/1917
- Sperry Letter: To Hoadley, invitation to inspect the searchlight at the Sperry works, 12/15/1917
- Wadleigh Postcard: To The Franklin Institute, acceptance of membership on the CSA Subcommittee for Application No. 2710, 1/1/1918
- CSA Assistant Letter: To C. Penrose, notification of appointment as a member of the Subcommittee to investigate the Sperry Light, 1/14/1918
- CSA Assistant Letter: To W.C.L. Eglin, notification of appointment as chairman of the Subcommittee to investigate the Sperry Light, 1/14/1918
- Penrose Postcard: To The Franklin Institute, acceptance of membership on the CSA Subcommittee for Application No. 2710, 1/15/1918
- M.M. Price Postcard: To The Franklin Institute, acceptance of membership on the CSA Subcommittee for Application No. 2710, 1/15/1918
- W.C.L. Eglin Postcard: To The Franklin Institute, acceptance of membership on the CSA Subcommittee for Application No. 2710, 1/15/1918
- C.W. Masland Letter: Notification of appointment as a member of the Sub-committee to investigate the Sperry Light, 2/7/1918
- C.W. Masland Postcard: To The Franklin Institute, acceptance of membership on the CSA Subcommittee for Application No. 2710, 2/8/1918
- CSA Assistant Letter: To Sperry, request for correct patent number information, 3/8/1918
- H.H. Thompson Letter: To Hoadley, correction of Lean patent number and enclosure of copy, 3/11/1918
- CSA Assistant Letter: To H.H. Thompson, receipt of Lean patent acknowledged, any further searchlight information will be appreciated, 3/13/1918
- CSA Assistant Letter: To W.C.L. Eglin, transmittal of search results on Searchlight, inspection information and report deadline, 3/13/1918
- CSA Assistant Letter: To W.C.L. Eglin, transmittal of search results on Searchlight, inspection information and report deadline (duplicate copy), 3/13/1918
- H.H. Thompson Letter: To Hoadley, attorney enclosure of confidential Searchlight instruction book, 3/15/1918
- CSA Assistant Letter: To Thompson, receipt of Sperry Searchlight instruction acknowledged and its confidentiality assured, 3/23/1918
- Hoadley Letter: To W.C.L. Eglin, transmittal of information in H.H. Thompson's 3/15/18 letter regarding inspection and recent developments, 3/23/1918
- G.H. Clamer Letter: To Hoadley, offer to have Northrup demonstrate improved arc lighting resulting from high frequency power supply, 6/13/1918
- Hoadley Letter: To Sperry, transmittal of Clamer's and Northrup's suggestion regarding searchlight power supply, 6/14/1918
- Hoadley Letter: To Clamer, acknowledgement and transmittal of information on improved searchlight power supply, 6/14/1918
- Sperry Letter: To Hoadley, acknowledgement of information on Clamer's and Nortrup's searchlight power supply experiments, 6/18/1918
- Hoadley Letter: To W.C.L. Eglin, offer of help in advancing the investigation of the Sperry Searchlight, 7/9/1918
- Hoadley Letter: offer of help in advancing the investigation of the Sperry Searchlight (duplicate copy), 7/9/1918
- Hoadley Postcard: schedule and topic of Committee on Science and the Arts meetings, 1/8/1919
- Hoadley Postcard: reply card sample for notification of Committee on Science and the Arts meeting attendance, 1/8/1919
- Hoadley Letter: To W.C.L. Eglin, notification of Subcommittee Meeting, 9/3/1919
- Hoadley Letter: To W.C.L. Eglin, notification of Subcommittee Meeting (duplicate copy), 9/3/1919
- W.C.L. Eglin Letter: To Hoadley, acknowledgement of Subcommittee meeting arrangements, 9/5/1919
- W.C.L. Eglin Letter: To Hoadley, acknowledgement of Subcommittee meeting arrangements (duplicate copy), 9/5/1919
- Hoadley Letter: To Sperry, resumption of investigation, suggestion for inspection of searchlight, litigation status query, 9/9/1919
- Hoadley Letter: To W.C.L. Eglin, indication that copies of the Minutes are being sent to committee members, 9/9/1919
- Hoadley Letter: To W.C.L. Eglin, indication that copies of the Minutes are being sent to committee members (duplicate copy), 9/9/1919
- CSA Minutes: From CSA Assistant, suggested request to Sperry for further technical details regarding innovative characteristics, 9/9/1919
- Hoadley Letter: To F.R. Wadleigh, enclosure of minutes, suggestion for New York inspection of the Sperry Searchlight, 9/10/1919
- Sperry Letter: TO Hoadley, offer to show searchlight operation, denial of patent infringement, clarification of technical performance, 9/17/1919
- Hoadley Letter: To W.C.L. Eglin, discusses the effects of GE legal action on the immediate investigation, 9/18/1919
- Hoadley Letter: To W.C.L. Eglin, excerpts details from E.A. Sperry letter concerning patent litigation maybe delaying Subcommittee progress, 9/18/1919
- Wadleigh Letter: To Hoadley, information that inspection of the Sperry Searchlight in New York is impossible, 9/20/1919
- Hoadley Letter: To W.C.L. Eglin, information that inspection of the searchlight in New York impossible, Philadelphia a possibility, 9/22/1919
- Hoadley Letter: To W.C.L. Eglin, information that inspection of the searchlight in New York impossible, Philadelphia a possibility (duplicate copy), 9/22/1919
- Eglin Letter: To Hoadley, confirmation of the necessity of an examination of the Searchlight in Philadelphia, 9/25/1919
- Eglin Letter: To Hoadley, confirmation of the necessity of an examination of the Searchlight in Philadelphia (duplicate copy), 9/25/1919
- Sperry Letter: To Hoadley, list of Philadelphia locations of operating High Intensity Searchlights, 10/8/1919
- G.C. Cox Letter: To CO, Philadelphia Naval Yard, Subcommittee's request for an inspection of the installed Sperry Searchlights, 10/20/1919
- Aide to Commandant Letter: To G.C. Cox, indication that inspection request has been forwarded to the CO, USS Nevada, 10/21/1919
- CSA Minutes: From CSA Assistant, Subcommittee adjourns to inspect operating lights at the Philadelphia Naval Yard, 11/4/1919
- Librarian Letter: To Arma Engineering Co., request for descriptive matter on their High Intensity Searchlight, 11/26/1919
- G.C. Cox Letter: TO Carlisle & Finch Co., request for descriptive matter on their lamp found in the inspection aboard the U.S.S. Nevada and Kansas, 11/26/1919
- CSA Assistant Letter: To Sperry, notification of Searchlights inspection on board U.S. warships, request on litigation status, 11/26/1919
- Carlisle & Finch Co. Letter: To G.C. Cox, indicating themselves as manufacturers of mechanical parts only for the Searchlight, 11/28/1919
- H.H. Thompson Letter: To G.C. Cox, response to 11/16/19 letter; details of Sperry rebuttal in the patent infringement suit, 12/1/1919
- CSA Assistant Letter: To W.C.L. Eglin, request for agreement to table this case until pending litigation is resolved, 4/12/1920
- W.C.L. Eglin Letter: To Hoadley, agreement to table Case #2710 pending settlement of patent infringement litigation, 4/16/1920
- CSA Assistant Letter: To Sperry, request for information on settlement of the patent infringement litigation, 1/11/1921
- H.H. Thompson Letter: To Hoadley, information that the patent infringement litigation is ended, 1/12/1921
- CSA Assistant Letter: To Thompson, request for documentation of litigation settlement and update on searchlight improvements, 1/13/1921
- Hoadley Letter: To W.C.L. Eglin, informing of request to Sperry for documentation of the litigation settlement, 1/13/1921
- H.H. Thompson Letter: To Hoadley, printed record of litigation settlement non-existent; details on success of the Sperry Searchlight in movie studio applications, 1/14/1921
- Hoadley Letter: To W.C.L. Eglin, transmittal of letter from Sperry Patent Department concerning the High Intensity Arc Lamp, 1/15/1921
- W.C.L. Eglin Letter: To Hoadley, Sperry Co. letter regarding priority of invention is insufficient, more information essential, 1/18/1921
- CSA Assistant Letter: To C. Lichtenberg, request for details on illustrations in article on U.S. Army Searchlights, 1/19/1921
- CSA Assistant Letter: To Thompson, request for absolute confirmation of Sperry as inventor of the High Intensity Searchlight, 1/19/1921
- C. Lichtenberg Letter: To Hoadley, listing of origin of illustrations in paper on U.S. Army Searchlights, 1/21/1921
- H.H. Thompson Letter: To Hoadley, detailed explanation of the originality of Sperry's invention, 1/22/1921
- CSA Assistant Letter: To C. Lichtenberg, explanation of request for information on searchlights, 1/24/1921
- Sperry Letter: To C.W. Masland, suggestion to resume examination in view of litigation settlement and technical improvements, 3/12/1921
- Masland Letter: To H.J. Creighton, transmittal of Sperry 3/12/1921 for decision on further action, 3/15/1921
- Evidential Information
- Application
- Application: Completed application for investigation of the Sperry High Intensity Searchlight, 11/10/1917
Patents
- U.S. Patent No. 593,899 to George R. Lean et al for Electric-Arc Lamp, Specification, 11/16/1897
- U.S. Patent No. 1,029,787 to Heinrich Beck for Electric-Arc Lamp for Searchlights, Projectors and the like, 6/18/1912
- U.S. Patent No. 1,227,210 to Elmer A. Sperry for Method of Operating Flaming-Arc Lights for Projectors, 5/22/1917
- Publications
- Miscellaneous
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