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4 Tolles eyepieces

4 Tolles eyepieces

Robert B. Tolles
1860-1874
35mm Prado slide projector

35mm Prado slide projector

Ernst Leitz (company)
1950-1960
Abney reflecting level and clinometer

Abney reflecting level and clinometer

Troughton & Simms
circa 1910
air pump

air pump

Edward Samuel Ritchie
circa 1850
analytical balance

analytical balance

American Balance Corporation
circa 1960
aneroid barometer

aneroid barometer

Andrew J. Lloyd Company
circa 1910
Arm protractor and goniometer

Arm protractor and goniometer

Samuel Lewis Penfield
dated 1923
artificial horizon

artificial horizon

English
1850-1900
automatic fraction collector

automatic fraction collector

AO Instrument Company, Warner Chilcott Laboratories
circa 1965
bag of wax

bag of wax

American
1900-1950
bar magnet

bar magnet

English
1890-1930
bar magnet

bar magnet

English
1890-1930
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The Collection of Historical Scientific Instruments
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