The Astronomical Observatories of Jai Singh c15.s2.t1.10
The Astronomical Observatories of Jai Singh c15.s2.t1.10
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c15.s2.t1.10
¹ The graduated bar, of course, measures the chords of the arcs, and "as it was much easier to graduate a straight line than an arc, the triquetrum continued to be the favourite instrument down to the end of the sixteenth century." (DREYER, p. 332.) This is the Zāt al Shu' batayn mentioned by Jai Singh (see page 12).