Writing on bottom states, "Diesel Oil Tank - Tanks No. 1 No.2 - US Navy Yard, SC. November 25, 1943 Additional Fuel Oil Storage Tanks Built on Contr. Noy 5425. File 11-25-43-2."
Writing on bottom states, "1134-42 US Navy Yard, SC. August 1, 1942. Plate #5. General Elecric 540 KW Sweep Generator. Switchboard showing Terminal Strip and Thyrite Resistor. Note Terminals 52 & 53 (arrow) and leads to Reference Field of Amplidyne. File 13558."
Writing on bottom states, "1139-42 US Navy Yard, SC. August 1, 1942. Wheatstone Bridge type control for AMplidyne controlled sweep generator. (specs. follow) File 13563."