Altitude and Azimuth Instrument

Description:

This astronomical instrument belonged to Columbia College (now University), and dates from around 1837. The horizontal and vertical circles are silvered, graduated to 10 minutes, and read by verniers to 10 sec. The inscription reads "Troughton & Simms, London."

Ref: Frederick W. Simms, A Treatise on the Principal Mathematical Instruments Employed in Surveying, Levelling, & Astronomy (Baltimore, 1844), pp. 89–109, describes a similar instrument with two vertical circles.

Date Made: ca 1837

Maker: Troughton and Simms

Location: Currently not on view

Place Made: United Kingdom: England, London

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

Exhibition:

Exhibition Location:

Related Publication: Simms, Frederick W.. Treatise on the Principal Mathematical Instruments Employed in Surveying, Levelling, & Astronomy; 5th Edition

Credit Line: Columbia University. Department of Physics

Data Source: National Museum of American History

Id Number: PH.323689Catalog Number: 323689Accession Number: 249200

Object Name: altitude and azimuth instrument

Measurements: overall: 21 in; 53.34 cmhorizontal circle: 11 1/2 in; 29.21 cmvertical circle: 9 in; 22.86 cmtelescope: 20 in; 50.8 cmoverall: 22 in x 20 in x 15 in; 55.88 cm x 50.8 cm x 38.1 cm

Metadata Usage: CC0

Guid: http://n2t.net/ark:/65665/ng49ca746a5-6fc7-704b-e053-15f76fa0b4fa

Record Id: nmah_747477

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