Stenometer

Description:

William J. Peters of the U. S. Geological Survey devised a split objective range finder in 1898, while doing reconnaissance work in Alaska. George N. Saegmuller, proprietor of Fauth & Co., explained its function: "Having a fixed base of known dimensions defined by targets, the measurement is made by bringing the images of the targets together by moving the halved objective by means of a micrometer screw." The U.S. Geological Survey transferred this example to the Smithsonian in 1909, reporting that "Distances up to 1 or 2 miles can be determined with sufficient accuracy for reconnaissance work." This seems to be an early example. "U.S.G.S. No. 3" is scratched onto its surface.

Ref: George N. Saegmuller, Descriptive Price-List of First-Class Engineering & Astronomical Instruments (Washington, D.C., 1901), p. 108.

Date Made: ca. 1900

Location: Currently not on view

See more items in: Medicine and Science: Physical Sciences

Exhibition:

Exhibition Location:

Credit Line: U. S. Geological Survey

Data Source: National Museum of American History

Id Number: PH.252977Accession Number: 49676Catalog Number: 252977

Object Name: stenometer

Measurements: overall: 5.7 cm x 15 cm x 11 cm; 2 1/4 in x 5 7/8 in x 4 5/16 inoverall: 4 1/2 in x 2 5/16 in x 6 1/4 in; 11.43 cm x 5.87375 cm x 15.875 cm

Guid: http://n2t.net/ark:/65665/ng49ca746aa-2fc1-704b-e053-15f76fa0b4fa

Record Id: nmah_1183941

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