Letter, from William Derham to Richard Waller, dated at Upminster Observations of the lunar eclipse made with a six foot telescope Apologies that he did not have Hevelius's map of the moon to observe the spots as the shadow passed over, but will rectify this Figure of lunar eclipse attached Printed in 'Philosophical Transactions', vol 27, no 336, p 522 Read to the Royal Society on 24 January 1711 14 January 1711