Ferguson's Pedograph

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Description:

Established in 1879, the U.S. Geological Survey tested distance measurers to see which best suited their purposes. Those that failed muster were sent to the Smithsonian. This Ferguson Pedograph is one of those instruments.

Ref: Thomas Tapley Helenus Ferguson, “Surveying Instrument,” U.S. Patent 709,313 (Sept. 16, 1902).

Thomas Ferguson, Automatic Surveying Instruments and Their Practical Uses on Land and Water (London, 1904).

Date Made: early twentieth century

Location: Currently not on view

See more items in: Medicine and Science: Physical Sciences, Measuring & Mapping

Exhibition:

Exhibition Location:

Data Source: National Museum of American History

Id Number: PH.252973Accession Number: 49676Catalog Number: 252973

Object Name: Pedograph

Measurements: overall: 3 3/4 in x 14 3/4 in x 13 5/8 in; 9.525 cm x 37.465 cm x 34.6075 cmoverall: 4 in x 14 in x 13 5/8 in; 10.16 cm x 35.56 cm x 34.6075 cm

Metadata Usage: CC0

Guid: http://n2t.net/ark:/65665/ng49ca746b3-91cf-704b-e053-15f76fa0b4fa

Record Id: nmah_1393162

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