Letter from R. Byham, Office of Ordnance, to Davies Gilbert, President of the Royal Society, 45 Bridge Street, Westminster In response to a letter from the Society, which enclosed a request from W. J. A. Lloyd for permission to have standard marks required in his Survey of the River Thames and a loan of a waterproof tent. Byham additionally references castings made in the Royal Brass Foundry at Woolwich. [Paper has faint watermark of woman with shield, fleur de lille and a mace.] 3 May 1830