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Two slide rules with azimuth and collimation scales

Slide rules (2), azimuth and collimation scales, brass, made by Angelo Tornaghi, Sydney, New South Wales, Australia, 1876, used at Sydney Observatory, New South Wales, Australia, 1876-1914. Two brass slide rules for use in astronomical work to adjust the error in the transit time of stars. Each has a central sliding vernier scale with a small knob at either end facilitating its movement. One slide rule is marked with a combined collimation and level scale, while the other is marked with an azimuth scale.

View object on the British Library on Flickr Commons site (opens in new window).

(Accession num: H10505)

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metal, ruler, slide rule, azimuth, collimation, scales, powerhouse, brass, tool, astronomy

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