Sentence Examples

  • Kempf with a polarizing photometer; but by far the most comprehensive work of the kind is the Harvard Photometric Durchmusterung (1901-1903), embracing all stars to 7.5 magnitude, and extended to the southern pole by measurements executed at Arequipa.
  • The gas obtained by the Young process, when tested by itself in the burners most suited for its combustion, gives on the photometer an illuminating value averaging from 50 to 60 candle-power, but it is claimed, and quite correctly, that the enriching power of the gas is considerably greater.
  • The instrument used at Harvard was a " meridian photometer," constructed on the principle of polarization; while the " method of extinctions," by means of a wedge of neutral-tinted glass, served for the Oxford determinations.
  • Bailey, was accordingly despatched (1889), and the meridian photometer erected successively in three different positions on the slopes of the Andes.