James Sayers

British physicist. He studied at Belfast and Cambridge, where he became a fellow of St John's (1941–6). A member of the British team associated with the Manhattan atomic bomb project (1943–5), he became professor of electron physics at Birmingham (1946–72). In 1949 he was given a government award for his work on the cavity magnetron valve, which was of great importance in the development of radar.

James Sayers (or Sayer) (1748 - April 20, 1823) was an English caricaturist. His plate of "Carlo Khan's triumphal entry into Leadenhall Street" was admitted by Charles James Fox, against whom it was directed, to have damaged his public image. Sayer was always at his best when attacking Fox, whose strong features he portrayed with remarkable power, always so as to make them convey expressions of defiant impudence or anger. Pitt, not known as a patron of the arts, provided Sayer with a place as marshal of the Exchequer court.

Sayer's "Carlo Khan" has been frequently reproduced. But he can only be judged with confidence after examining the collection in the British Museum, or other public libraries. They were then sold in collections of the size of a large octavo copybook, under such titles as Illustrious Heads (1794) or Outlines of the Opposition (1795). Sayer left a complete gallery of small full-length pictures of the public men of his time, slightly caricatured.