August Lingke Telescopic Alidade

Description
The telescope of this instrument has stadia wires and a hanging level. The base has a level vial, a screw adjustment, and a vertical arc that extends 50 degrees either way and that is read by vernier to single minutes. There is also a plumbing arm for use on plane tables.
Albert Joseph Seligman (1859-1935) probably bought this alidade in the late 1870s, when he studied mining engineering at Freiberg, and he probably donated it to the Rensselaer Polytechnic Institute, his alma mater, around 1899, when he obtained a seat on the New York Stock Exchange. The signature reads "AUGUST LINGKE & CO FREIBERG IN SA NO 1315." A German silver tag on the wooden box reads "Albert J. Seligman New York."
Location
Currently not on view
Object Name
telescopic alidade
maker
August Lingke & Co.
Measurements
telescope: 13 1/2 in; 34.29 cm
base: 20 in; 50.8 cm
case: 21 1/8 in x 9 1/2 in x 5 1/8 in; 53.6575 cm x 24.13 cm x 13.0175 cm
place made
Deutschland: Sachsen, Freiberg
ID Number
2001.0300.03
accession number
2001.0300
catalog number
2001.0300.03
subject
Measuring & Mapping
Surveying and Geodesy
See more items in
Medicine and Science: Physical Sciences
Surveying and Geodesy
Data Source
National Museum of American History, Kenneth E. Behring Center

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