10 inch theodolite, made by Troughton & Simms, London. Vertical arcs of approx 45 degrees. Used at Melbourne Observatory.

Physical Description

Scales on silver to five minutes. Micrometers & microscopes. Tangent screws & spring. Stride level. The head of each opposing micrometer microscope is divided into 60 equal parts, thus enabling the horizontal circle to be read to one second.

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