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2- or 3-mirror adjustable kaleidoscope

L. E. Knott Apparatus Company

circa 1900

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

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

astatic galvanometer with moving magnet

L. E. Knott Apparatus Company

circa 1910

audio oscillator teaching model

Department of Physics, Bowdoin College

after 1950

audio oscillator teaching model

Department of Physics, Bowdoin College

after 1950

balance

L. E. Knott Apparatus Company

1910-1920

ball used in physics demonstrations

Wiffle Ball Inc.

circa 1954

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2- or 3-mirror adjustable kaleidoscope

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

astatic galvanometer with moving magnet

audio oscillator teaching model

audio oscillator teaching model

balance

ball used in physics demonstrations