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Published online by Cambridge University Press: 18 January 2010
The planetarium consists of an optical projector centrally situated under a dome. The viewers sit around the projector instrument in chairs designed to give a comfortable view over the whole interior. The instrument used by the writer is the Spitz A2, manufactured by Spitz Laboratories, Inc., Delaware, U.S.A. Seating is provided for 40 persons under a 20-ft. dome in the particular installation at the South African Nautical College General Botha, Gordon's Bay, Cape.