21. This allowed astronomers to determine the distance of stars, including main sequence and giants, using the spectroscope . 22. I was curious one day so i got a pocket spectroscope and looked at my LCD monitor with it. 23. In 1875 the Parisian chemist Paul Emile Lecoq de Boisbaudran used a spectroscope to discover a new metallic element. 24. Between 1859 and 1861, he worked on the capillarity of liquids and the workings of the spectroscope in Heidelberg. 25. His silver tester, photometer for pigment printing and heliotype printing, and universal spectroscope were introduced into general use. 26. Beebe carried a painted spectroscope to measure the rate at which the various colors of light vanished as he descended. 27. The company built telescopes, spectroscopes and photometers one of Steinheil's inventions, used to measure brightness. 28. The light then passed through a prism ( in hand-held spectroscopes , usually an Amici prism ) that dispersion. 29. A mass spectroscope configuration was used in early instruments when it was desired that the effects of adjustments be quickly observed. 30. A spectroscopic binary is called double-lined when the absorption lines of both stars can be observed with a spectroscope .
