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  • Terms: stone
/ 4
precision balance

precision balance

F. W. Braun & Company
circa 1922
balance in wooden and glass case

balance in wooden and glass case

O. P. Drake & Company
1850-1870
obsidian sample in a sealed glass tube

obsidian sample in a sealed glass tube

Percy Williams Bridgman
dated 1924
two feldspar cylinders in cardboard box

two feldspar cylinders in cardboard box

Percy Williams Bridgman
dated 1916
astronomical regulator, no. 370

astronomical regulator, no. 370

William Bond and Son
circa 1864
plugs and sockets for coupling apparatus in a stoppered glass test tube

plugs and sockets for coupling apparatus in a stoppered glass test tube

Percy Williams Bridgman
1919-1932
heating element ?

heating element ?

American
1900-1950
gas jet furnace

gas jet furnace

American
1870-1930
Hering's color blindness apparatus

Hering's color blindness apparatus

Rudolph Rothe
circa 1893
log glass

log glass

American
1825-1900
sand glass

sand glass

German
17th Century
variation compass

variation compass

Georg F. Brander
circa 1780
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