Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 418
llingon {(/ 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 produced by the screen L,, surroundedby an annular ring of light produced by L. When the illumina-tion on the two sides of the screen… … M (A KQ 0. S HXO o QO XH u£ ooo ELECTRIC LIGHTTXG 65 and prisms are arranged so that they can be reversed readily andtwo readings should ahvays be taken to compensate for any ine-qualiti3s in the sides of the screen and the reflecting surfaces, a
Architecture · Building · Carpentry
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