Altitude and azimuth instrument, 12 inch circle, made by Troughton & Simms, London.

This instrument was used for the Geodetic Survey of Victoria, 1858-71, which established the primary surveying points throughout the colony. Also used by Melbourne Observatory.

Physical Description

Circles graduated on silver & read by verniers. In two wooden boxes: 1. stand and horizontal circle; 2. telescope and vertical circle.

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