AN INDIAN BRASS ASTROLABE  India, late 18th - early 19th century  Of typical form, the limb divided 1-60 by 1 and marked by 5, four etched plates, the rete with 30 named star pointers, the throne of cusped shape and plain, pin and horse in place, the reverse with trigonometric quadrant and shadow square, the back and front profusely inscribed in Devanagari script, 28cm high and 21cm radius.