Sentence Examples


  • See Vincent of Beauvais, Speculum historiale, book xxxii.
  • Francois and Speculum perfectionis, and Lempp's Frere Elie de Cortone.
  • No further practical advance appears to have been made in the design or construction of the instrument till the year 1723, when John Hadley (best known as the inventor of the sextant) presented to the Royal Society a reflecting telescope of the Newtonian construction, with a metallic speculum of 6-in.
  • Such speculum metal is exceedingly hard and brittle, takes a fine white polish, and when protected from damp has little liability to tarnish.
  • Xliv., February 1857), proposed to employ glass for the specula of telescopes, the reflecting surface of the glass speculum to be covered with silver by Liebig's process.
 

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