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(181 - 200 of 247)
Microscope, brass eyepiece
Traveling wave tube
Potentiometer, low resistance standard
Unidentified fuze with propeller
Calculator, Marchant
Wrico lettering set
Rolling parallel ruler
PIR-1 (Mk146) fuze
PIR-9 fuze
Microscope in wood box
Mortar and pestle (2)
Ion chamber
Oxygen meter, Pauling, Model K
Hydrogen lamp power supply, Model B
Thacher’s calculating instrument (2 views)
Keuffel & Esser Transit
Pyrometer, Wanner no. 2385
Tower drafting compass