Sommerfeld, Arnold, 1868-1951 [Letter to George F. Fitzgerald from A. Sommerfield], 12th August 1899. - Witham, Essex, 1899. - 1 18 x 11 cm. sheet (folded) ; Subjects--Personal Names: Larmor, Joseph, Sir, b. 1857. Subjects--Topical Terms: Observatories.