The letter above was sent by the Sperry Gyroscope Company's attorney, Herbert H. Thompson, to acting Franklin Institute secretary George A. Hoadley, indicating that the accompanying instruction manual for the Sperry searchlight (below) should be kept confidential due to the war.
Page through the original Searchlight Instructions and Part List manual on this page.
Click on the right-hand page, drag it to the left, and click to drop the "turned" page. View successive pages of the booklet in this way. To magnify details of a particular page, click the Magnify tool at the bottom. Close it by clicking the "X" on the Magnify tool.
