Ferguson's Pedograph


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 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

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

Record Id: nmah_1393162

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.