Ferguson's Pedograph

Ferguson's Pedograph

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Usage conditions apply
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).
Currently not on view
Object Name
date made
early twentieth century
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 cm
overall: 4 in x 14 in x 13 5/8 in; 10.16 cm x 35.56 cm x 34.6075 cm
ID Number
accession number
catalog number
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Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History
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