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optical glass and lenses

optical glass and lenses

Czechoslovakian
1900-1950
linear thermopile

linear thermopile

Central Scientific Company
1940-1950
Duboscq photogenic lantern

Duboscq photogenic lantern

Louis Jules Duboscq
1860-1879, 1882-1885
solar light source

solar light source

Louis Jules Duboscq
1850-1880
stoppered glass bottle of benzine [empty]

stoppered glass bottle of benzine [empty]

Chemistry Laboratory, Harvard College
circa 1900
alembic capital

alembic capital

American
1870-1920
tube

tube

American
late 19th-early 20th Century
arc lamp projector: sciopticon

arc lamp projector: sciopticon

McIntosh Stereopticon Company
1912-1920
plano-convex lens on a telescoping brass stand

plano-convex lens on a telescoping brass stand

French
1850-1880
device to puncture card with electric spark

device to puncture card with electric spark

French
1810-1850
geometric demonstration model

geometric demonstration model

Walter Balcke
1952-1964
hydraulics slide chart

hydraulics slide chart

Robert E. Martin
ca. 1940-1970
/ 1081

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