Surveyor's Transit


Keuffel & Esser offered this distinctive form of instrument, with the twisted standards, from the early 1890s to around 1915. This example, which has a vertical arc extending over 160 degrees, was made around 1901, and belonged to the University of Montana. New, it cost about $220. The solar attachment, which allows the surveyor to determine the astronomical meridian, latitude, and time, cost an additional $50.

The horizontal circle is read by opposite verniers to single minutes. The vertical arc is read by vernier to single minutes. There are clamps and tangent screws to the horizontal circle and to the telescope axis. The signature reads "KEUFFEL & ESSER CO. 5884 NEW YORK" and "PATENTED DEC. 3. 89. MAY 26. 91. OCT. 13. 91." The dates refer to patents granted to John Paoli.

Ref: Keuffel & Esser, Descriptive Price-List of Improved Surveying Instruments (New York, 1893 ), pp. 11-13.

Maker: Keuffel & Esser Co.

Location: Currently not on view

Place Made: United States: New York

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


Exhibition Location:

Related Publication: Keuffel & Esser. Descriptive Price-List of Improved Surveying Instruments

Credit Line: University of Montana, School of Forestry, Montana Forest and Conservation Experiment Station

Data Source: National Museum of American History

Id Number: 1984.0636.09Catalog Number: 1984.0636.09Accession Number: 1984.0636

Object Name: transit

Measurements: overall: 12 1/2 in; 31.75 cmhorizontal circle: 6 1/2 in; 16.51 cmvertical arc: 5 in; 12.7 cmneedle: 4 3/4 in; 12.065 cmtelescope: 11 1/4 in; 28.575 cmhanging level: 5 in; 12.7 cmtelescope solar attachment: 6 in; 15.24 cmoverall: 16 in x 13 1/8 in x 8 7/8 in; 40.64 cm x 33.3375 cm x 22.5425 cm


Record Id: nmah_997308

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