title: Prism beamswitch for radio telescopes.
abstract: A dielectric prism and switching mechanism have been constructed for beamswitching a Cassegrain radio telescope. Spatially extended radio sources may be mapped without significant confusion utilizing the sensitivity and stability inherent in the conventional Dicke radiometer.
authors.affiliation: National Radio Astronomy Observatory, Tucson, AZ 85712, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Payne
authors.forename: B L
authors.initials: BL
authors.lastname: Ulich