(London, W. Bowyer and J. Nichols, 1777). 4to. Extracted from "Philosophical Transactions", Year 1777. Vol. 67 - Part II. Pp. 598-607 and 3 large folded engraved plate. One of these the well known view of the Banaras Jantar Mantar by Archibald Campbell, measuring 23x43 cm. Wide-margined, clean and fine.
The paper describes one of the five famous observatories built by Maharaja Sawai Jai Singh II of Jaipur, consisting of stone instruments used for determining solar time precisely, based on Muslim design principles.