projection electroscope
Datecirca 1920
Inventory Number0522
ClassificationElectroscope
Subject
Maker
Wm Gaertner & Company
1896 - 1923
User
Theodore William Richards
1868 - 1928
User
Department of Chemistry, Harvard University
founded 1791
Cultural Region
Place of Origin
Dimensions32.6 × 33 × 16.5 cm (12 13/16 × 13 × 6 1/2 in.)
diameter of cylinder: 15 cm (5 7/8 in.)
diameter of cylinder: 15 cm (5 7/8 in.)
Material
Accessoriesheavy metal stand (attached)
DescriptionCylinder of electroscope on heavy metal stand. The lamp and scale which once belonged to the instrument are missing.
Signedon instrument: WM. GAERTNER & Co. / -MAKERS- / CHICAGO
InscribedLight brown packing tape written in black marker: Carnegie GC. E789
Curatorial RemarksTwo tags: one reads "Chem 5/5/52" and the other reads "property of the Carnegie Institution of Washington" Was first incorrectly catalogued as 1997-1-0167, so slide shows it with that number.
FunctionFor high voltage experiments. The light projects the scale on a screen to see the current level.
ProvenanceDepartment of Chemistry, Harvard University; transferred to CHSI May 5, 1952.
Historical AttributesUsed by Prof. Theodore W. Richards, a Harvard Noble Prize winner.
Wm Gaertner & Company
Date: 1900-1920
Accessories: micrometer eyepiece, eyepiece adaptor
Object number: 1997-1-1836
M. Leyser
Date: circa 1858
Accessories: vertical leather carrying case; battery (DW0779b)
Object number: DW0779a
Wm Gaertner & Company
Date: circa 1930
Accessories: objective; ocular
Object number: 1166
