Small refractometer
1950-1975
Box of mixing prisms to demonstrate blooming
1950-1975
Catadioptric reflecting telescope
1960-1975
"Introscope" in box
1950-1975
Micromanometer in box
1950-1975
Sidereal clock, electrically driven
1950-1975
Refractometer
1950-1975
Spider-web forks in envelope
Drawing-board
Twin Zeiss Ikon stereo cameras
Selenium photocells by Megatron Ltd.
Radius measurer, plus older two-lamp radius gauge
1950-1975
Micro-monochromator
1950-1975
Weston Photronic Cell
1930-1950
Occultation reaction timer
1950-1975
Stereoscope plus stereo pictures
Subminiature Foucault knife-edge tester
1950-1975
Radiation measuring apparatus: five items
1950-1975
Microbarometer in box plus converted bicycle pump
Catadioptric collimator, aperture 2.4 inches
1950-1975
Three Dall null testers on two stands
1950-1975
Two optical pinholes
1950-1975
Aluminizing plant with transformer
1950-1975
Three spring balances
Graticule engraver
1950-1975
Two self-marking Knife-edge Foucault testers
1950-1975
Experimental and lens-grinding apparatus
Tripod mirror-grinding table with glass top
1950-1975