Plate, diagram of local attraction over China and Central Asia by John Henry Pratt Unpublished diagram of local attraction overlaid on a hand-drawn map of China and Central Asia. Subject: Geodesy Published in Philosophical Transactions as 'On the effect of local attraction upon the plumb-line at stations on the English Arc of the Meridian, between Dunnose and Burleigh Moor; and a method computing its amount'. Written by Pratt at Deep River, Cape of Good Hope [Diep River, Western Cape, South Africa]. Communicated by Prof [James] Challis. Received by the Royal Society on 5 June 1855. Read 21 June 181 23 September 1854