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.
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(Accession num: H10505)
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