Browse Items (327 total)

Hilgar Fluorite, Filter plates

Fluorite filter plates in a wooden box.

Spencer Lens Company, Microfilm Reader

Device for reading microfilm

Variable Resistor

Cast iron variable resistor

Unknown Title

Unknown use

Prism

Mounted prism

National Protocolor Corporation, Pellicle

Pellicle in a storage box

Diffraction Grating in Holder Frame

Diffraction grating in a holder used to create spectrograms

Film cutter

Film cutter for Schmidt camera

Relay tube

Relay tube w/scale and prism

Optometric Tools, Measuring engine

Device for measuring the positions of stars or lines in spectrograms