Gravity Pendulum
date: label: date made
content: ca 1931
name: label: maker
content: Askania
notes: label: Description
content: Along with gravimeters and torsion balances, pendulums can be used to measure gravitational force. The period oscillation of the pendulum can be used to measure gravitational acceleration, and in turn used in prospecting for natural resources. Different types of underground resources have different densities, increasing or decreasing gravitational attraction that can be detected by pendulums.
label: Description
content: This is one of two similar instruments that the Humble Oil & Refining Co. purchased in 1931, and used to determine the force of gravity near Houston, Texas. It is a photographic recording instrument with four invariable pendulums of the sort that the Austrian military officer, Robert von Sterneck, designed in the 1880s. Carl Bamberg offered instruments of this sort, with "price by arrangement" for some 20 years, and Askania Werke continued the tradition.
label: Description
content: Ref: Notes prepared by D.H. Gardner, August 19, 1959, in NMAH accession file.
label: Description
content: Carl Bamberg, <i>Preis-Verzeichnis. No. XI. Wissenschaftliche Instrumente</i> (1904), pp. 50-52.
label: Description
content: M. Haid, "Neues Pendelstativ," <i>Zeitschrift für Instrumentenkunde</i> 16 (1896): 193-196.
place: label: place made
content: Germany: Berlin
setName: label: See more items in
content: Work and Industry: Agriculture and Natural Resources
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content: Natural Resources
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content: Measuring & Mapping
creditLine: label: Credit Line
content: Humble Oil and Refining Company
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: AG.MHI-P-7681
label: catalog number
content: MHI-P-7681
label: accession number
content: 230370
objectType: label: Object Name
content: pendulum, recording