August Lingke Telescopic Alidade

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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."
Currently not on view
August Lingke & Co.
place made
Deutschland: Sachsen, Freiberg
telescope: 13 1/2 in; 34.29 cm
base: 20 in; 50.8 cm
overall in case: 5 in x 21 1/8 in x 9 3/8 in; 12.7 cm x 53.6575 cm x 23.8125 cm
ID Number
accession number
catalog number
Credit Line
Rensselaer Polytechnic Institute, Department of Civil Engineering
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Medicine and Science: Physical Sciences
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Surveying and Geodesy
Data Source
National Museum of American History