Physical laboratory experiments : mechanics, optics and heat (1917)
Goodwin, H. M. (Harry Manley), 1870- · Boston : G. H. Ellis Co., Printers · leaf 162
beenadjusted, it is only necessary to direct the latter towardthe former so that the image of the slit comes into the fieldof view, and then to adjust the slit back and forth until itsimage appears sharply defined on the cross hairs withoutparallax. The slit is then at the principal focus of the… … Focus the eye-piece on the cross hairs as before. Thenfocus the telescope approximately for parallel rays by di-recting it upon some object in the room, as far away as pos-sible. Next illuminate the slit with monochromatic light(sodium flame), and place a prism upon the table approxi-mately in the…
Physics · Mechanics
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