Sentence Examples

  • Science, 1825); Herschel's instrument has since been discarded in favour of the pyrheliometer (Gr.
  • He especially devoted himself to investigations of the radiation of heat from the sun and its absorption by the earth's atmosphere, and to that end devised various delicate methods and instruments, including his electric compensation pyrheliometer, invented in 1893, and apparatus for obtaining a photographic representation of the infra-red spectrum (1895).