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$3 diffraction color photographs, slit, color photograph on lantern slides$

3 diffraction color photographs, slit, color photograph on lantern slides

American

circa 1906

$Abbe refractometer, Zeiss Model I$

Abbe refractometer, Zeiss Model I

Carl Zeiss Jena

circa 1915

A.C. voltmeter, 0-10, US Navy type

General Electric Company

1945-1960

aircraft navigational computer

G. Felsenthal & Sons

ca. 1940-1955

Altec type A341A amplifier

Altec Lansing

1955-1956

AMRAD type 2611 variometer

American Radio and Research Corporation

circa 1921

apothecary's balance

American

mid 19th Century

apparatus to show expansion of metal upon heating

American

1870-1900

Archimedean water screw demonstration

American

1880-1940

audio oscillator teaching model

Department of Physics, Bowdoin College

after 1950

audio oscillator teaching model

Department of Physics, Bowdoin College

after 1950

azimuth instrument

National Electrical Machine Shops, Inc.

circa 1942

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3 diffraction color photographs, slit, color photograph on lantern slides

Abbe refractometer, Zeiss Model I

A.C. voltmeter, 0-10, US Navy type

aircraft navigational computer

Altec type A341A amplifier

AMRAD type 2611 variometer

apothecary's balance

apparatus to show expansion of metal upon heating

Archimedean water screw demonstration

audio oscillator teaching model

audio oscillator teaching model

azimuth instrument