Plate, 'Map of part of the environs of Madras shewing the relative positions of the Observatory House Station and the guns, used in the experiments by J Goldingham, FRS for ascertaining the velocity of sound' by unknown artist Watercolour map of the area of Madras [Chennai] where John Goldingham conducted his experiments on the velocity of sound. Subject: Acoustics / Physics Published in Philosophical Transactions as 'Experiments for ascertaining the velocity of sound, at Madras in the East Indies'. Written by Goldingham in Madras [Chennai, India]. Read 20 February 1823. 31 May 1822