Page:Popular Science Monthly Volume 75.djvu/529

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cessive images of what is contained by the slit are presented arranged according to their wave-lengths. In practise the rays of light from the slit enter a small telescope called the collimator, and are there rendered

PSM V75 D529 Sketches of the planet venus.png

Sketches of the Planet Venus.
Sketches of different observers showing agreement, made at Tacubaya, Mexico, on February 7, 1897.