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3.5X magnifier

3.5X magnifier

Bausch & Lomb Optical Company
1937-1947
4.5-inch telescope objective

4.5-inch telescope objective

Bausch & Lomb Optical Company
circa 1900
4 Tolles eyepieces

4 Tolles eyepieces

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

35mm Prado slide projector

Ernst Leitz (company)
1950-1960
Abbe-type microscope camera lucida

Abbe-type microscope camera lucida

Bausch & Lomb Optical Company
circa 1929
Abbe-type microscope camera lucida

Abbe-type microscope camera lucida

Bausch & Lomb Optical Company
circa 1929
Abbe-type microscope camera lucida

Abbe-type microscope camera lucida

Bausch & Lomb Optical Company
circa 1898
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
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The Collection of Historical Scientific Instruments
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