. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. need beadded to whathas been said inChapter III., ex-cept that all thelenses will, ofcourse, be brightand clean, or, ifnot so, will be fresh wiped with a wash-leather, kept forthat purpose alone in a collar-box, or something of thatkind, and religiously preserved from grease. A wash-leatheronce greased anywhere, is of no further use until lamp is fitted to its proper place, and it only has to betrimmed and attended to, and the slides properly focussedwith the rack and pinion. When
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. need beadded to whathas been said inChapter III., ex-cept that all thelenses will, ofcourse, be brightand clean, or, ifnot so, will be fresh wiped with a wash-leather, kept forthat purpose alone in a collar-box, or something of thatkind, and religiously preserved from grease. A wash-leatheronce greased anywhere, is of no further use until lamp is fitted to its proper place, and it only has to betrimmed and attended to, and the slides properly focussedwith the rack and pinion. When such a lantern is used with a tray and jet insteadof the lamp, again all the needful directions for the manage-ment of the light have been given in Chapter IV., but it willbe necessary now to carefully centre and adjust the light inthe manner described under § 62. A single lantern made for limelight only, however, isgenerally constructed differently. The body itself is made ofmahogany, and it is the lining of sheet-iron or tin which isattached to this: there is usually an all-brass front, with a. Fig. 57.—Iron Lantern LANTERNS AND THEIR MANIPULATION 103 gliding nozzle, and the whole pattern will closely resemblefig. 58. Such a lantern is often fitted with various objectivesand a lengthening tube; and except as regards dissolvingviews, or dioramic effects, exhibits single slides in as perfecta manner as the more costly apparatus next to be described.
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
