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Telescopic Alidade

Telescopic Alidade
A high standard alidade; this type of alidade permits direct viewing through the telescope. The level is mounted below the inverting telescope and the base (blade) is solid brass with circular voids. Manufactured by Keuffel & Esser, New York & New Jersey.

Object ID: USGS-000165


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Page Last Modified: Thursday, October 01, 2009