The book of lantern ; being a practical guide to the working of the optical (1888)

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THE BOOK OF THE LANTERN. 87 sheet, and in such a way that when it is stretched, the material of which the sheet is made will not pucker. At each end of this cord there should be a loop made by doubling it over, and wrapping it round with waxed thread. Along each side of the sheet should be placed, at intervals of about eighteen inches, galvanized iron rings, or brass curtain rings will answer the purpose. The bottom of the sheet may be left free. A screen of this description will require no fittings to hang it in position, beyond a couple of screw-eyes placed so far apart that the sheet will easily go between them ; and which should be inserted in the cornice or roof of the exhibition-room, with two more eyes placed immediately underneath the top ones, and screwed into the floor. Next are required two strong but thin cords; and it is best at the outset to procure these of the best quality possible, for upon their strength the sheet entirely depends. Eich cord should be fitted at one end with a swivel and clip like that upon a dog's chain. Having made these preparations the hanging of'even a large sheet will be comparatively easy. First, let the cords be run through the fixed screw-eyes in the roof or upper pirt of the wall; one cord through each eye, and so inserted that the clips on the cords are inside,— i.e., facing each other. Next clip the sheet to the cords by the loops pro- vided at the top corners, as already described. The sheet can now be pulled up bodily, —preferably by two persons, one at each cord. Next place the free ends of the cords through the screw-eyes in the floor, and stretching the sheet as tightly as possible, secure each by a simple knot.