. The book of photography; practical, theoretical and applied. Fig. 7S2. Fig. 782.—Isometric View op Prism Table. Fig. 783.—Details op Slit and Adjustable Standard. The Slit. The slit is fixed on to a short tube whichwill just slide inside the larger one. Theslit jaws are riveted by brass pins c andd (Fig. 783), to the end plate of brass,which is then soldered to the end of theshort tube. In the middle of the end plateis bored a small circular hole, which de-fines the length of the slit. It will be seenthat the jaws a and h may always be placedparallel, by employing the device of plac-ing the
. The book of photography; practical, theoretical and applied. Fig. 7S2. Fig. 782.—Isometric View op Prism Table. Fig. 783.—Details op Slit and Adjustable Standard. The Slit. The slit is fixed on to a short tube whichwill just slide inside the larger one. Theslit jaws are riveted by brass pins c andd (Fig. 783), to the end plate of brass,which is then soldered to the end of theshort tube. In the middle of the end plateis bored a small circular hole, which de-fines the length of the slit. It will be seenthat the jaws a and h may always be placedparallel, by employing the device of plac-ing the rivets on opposite sides of the endaperture. The jaws must be groundaccurately parallel, with their edgesbevelled as shown. The bevel must be SPECTROPHOTOGRAPHY. 583 inside, so that the light will be able todiverge. The jaws may be of steel, and itwould be better, perhaps, to replace c andd by little screws, as then the jaws couldbe removed for regrinding or cleaning. The Telescope. The object glass l,, must be like thecollimator lens. The piece b in whi
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
