Machinery and processes of the industrial arts, and apparatus of the exact sciences (1869)
Barnard, Frederick A. P. (Frederick Augustus Porter), 1809-1889 · Washington, Govt. print. off. · leaf 606
ther, so that a ray which enters at a,after two interior reflections emerges at d, at right angles to its originaldirection. The prisms are inclosed in the boxes marked C, (Fig. 130,) ofwhich they occupy buthalf the height, so that theobserver looking through e. the tubes marked V, cansee an object… … 590 PARIS UNIVERSAL EXPOSITION. The two objects thus seen are apparently coincident in direction ■ butreally the rays coming from them to the prisms, cross in the interior of theprism (as seen at A, Fig. 131) at right angles to each other. The observ-ing apparatus is hinged to the screen at G, for…
Machinery · Scientific apparatus and instruments
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