Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 416
lected to the pair of glass prisms A, B.The surfaces sr are ground to fit perfectly and any light falling onthis surface will pass through the prisms. Light falling on thesurface ar or hs will be reflected as shown by the arrows. Wesee then that the light from L, which falls on ar and h.s, is… … Fig. 54. screen M, to the pair of prisms A, B. The rays falling on thesurface sr pass through to the telescope T, while the rays fallingon {(/ and ^.s* are reflected and absorbed by the black lining of thecase. The field of light, as then viewed through the telescope,appears as a disc of light…
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