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(121 - 140 of 247)
Galvanometer, thermo, Duddell patent
Temperature gauge
Voltmeter, multicellular electrostatic (A)
Potentiometer, International OHM
Mk140 fuze
Compass in brass box
Vacuum circuit breaker
Travelling ruler
Keuffel & Esser Alidade
Beam compass
PIR-type fuze, model unidentified
Ion chamber in green box
Ion chamber, early
Diffraction grating, photo negative of
Keuffel and Esser drafting set
Barometer, aneroid
SIR (Mk139) fuze
Spectrophotometer, quartz
PIR-22A fuze