Letter from Dr [Louis Agricola] Bauer, Carnegie Institution of Washington, Department of Research in Terrestrial Magnetism, Washington D.C, to Sir Joseph [Larmor], the [Royal Society] Informs that he intends to publish a portrait of Edmund Halley in the next issue of "Terrestrial Magnetism", requesting to be supplied with a photograph as well as an autograph, suggesting he borrow a letter or some such document. Includes two internal Royal Society memorandums, dated 6 March 1911. 22 February 1911