Counter from the U.S. Geological Survey
date: label: date made
content: ca 1900
notes: label: Description
content: This instrument consists of a mahogany case, nailed shut, with two glass windows. Four openings in a brass plate are visible below one of the windows. These windows are marked on the brass 10, 100, 1000, and 10000. There are number dials below them. According to earlier cataloging, the instrument contains an electromagnet and clockwork which operates the counter. Powered by a battery, the device could count numbers of revolutions and similar phenomena. Measuring time with a stop watch, one could calculate velocities.
label: Description
content: A mark at the front of the top of the instrument and on the bottom reads: 39. The U.S. Geological Survey transferred the instrument to the Smithsonian in 1908. It had been used in the Water Resources Branch of the Survey.
label: Description
content: Reference:
label: Description
content: Accession file 48341.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Counters
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Transfer from U. S. Geological Survey
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.248693
label: catalog number
content: 248693
label: accession number
content: 48341
objectType: label: Object Name
content: counter
physicalDescription: label: Physical Description
content: glass (overall material)
label: Physical Description
content: mahogany (overall material)
label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 7 cm x 14.9 cm x 10.8 cm; 2 3/4 in x 5 7/8 in x 4 1/4 in