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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

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

ball used in physics demonstrations

Wiffle Ball Inc.

circa 1954

Baumé hydrometer for sulphuric acid

Electric Storage Battery Company

circa 1900

beat-frequency oscillator

General Radio Company

circa 1935

Beckmann thermometer

Eimer & Amend

1890-1910

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

Abbe refractometer, Zeiss Model I

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

ball used in physics demonstrations

Baumé hydrometer for sulphuric acid

beat-frequency oscillator

Beckmann thermometer