title: Hyperbolic cone-channel condenser.
abstract: An optical condensing system is described that consists of a lens and the polished interior of a cone generated by rotating a hyperbola about an appropriate axis. An optimum concentration of light is achieved in a relatively compact system. In certain circumstances the hyperbola reduces to a straight line, simplifying the construction of the cone.
authors.affiliation: Department of Physics, University of British Columbia, Vancouver, BC, Canada.
authors.forename: H P
authors.initials: HP
authors.lastname: Gush