Telescopic Alidade


This alidade has an inverting telescope, striding level, vertical arc reading 30 degrees each way, and separate trough compass. It is part of a complete plane table outfit that Keuffel & Esser described "as made for the U.S. Coast and Geodetic Survey" and sold for $175. The Survey acquired this example in 1893. The inscriptions read “KEUFFEL & ESSER CO. NEW YORK CHICAGO 2447" and "U.S.C.&G.S. No. 91.”

Ref: Keuffel & Esser, Catalogue (New York, 1906), p. 408.

Maker: Keuffel & Esser Co.

Location: Currently not on view

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


Exhibition Location:

Related Publication: Keuffel & Esser. Catalogue of Keuffel & Esser Co., 32 Edition

Data Source: National Museum of American History

Id Number: PH.309665Catalog Number: 309665Accession Number: 106954

Object Name: alidade (telescopic)

Measurements: telescope: 10 in; 25.4 cmobjective; aperture: 1 in; 2.54 cmoverall in case: 5 5/8 in x 13 5/16 in x 8 5/16 in; 14.2875 cm x 33.81375 cm x 21.11375 cm


Record Id: nmah_764357

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