The Astronomical Observatories of Jai Singh c15.s2.t1.8
The Astronomical Observatories of Jai Singh c15.s2.t1.8
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c15.s2.t1.8
(5) An instrument for measuring the diameter of the sun or moon. This consisted of two sights fixed on a bar. The objective was pierced with a comparatively large hole, and was moveable along the bar, over appropriate graduations. Special discs (like camera stops) were used with the objective.