Lantern-slide making and exhibiting ([pref. 1905])

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BINDING AND FINISHING. 21 slight tilting, from corner to corner, and pour the surplus back into the bottle. Then, giving the slide a gentle rotary movement, hold it over a gas or lamp flame till the varnish sets hard, which it will do in about a minute. Lantern slides are protected from Binding and . . Finishing. injury by binding them, film side in- wards, in contact with a piece of glass of the same size, a mask or disc of opaque paper with a square or oblong opening being inter- posed to improve the pictorial effect. Cover glasses of various qualities can be bought at the dealer's, the best should always be chosen, as specks and bubbles are frequently met with in the commoner kinds, and quite spoil the appearance of the slides. Spoilt lantern plates should never be de- stroyed, for if the films are cleaned off and the glass carefully polished they make good cover glasses. The bought glasses, by the way, also require clean- ing, and the following is a good cleaning and polish- ing mixture : Cleaning Cover Glasses. Tripoli ... ... ... ... 1 oz. Methylated spirit ... . . ... 1 oz. Liquid ammonia ... ... ... 1 drro Water ... ... ... ... 3 oz. A box of binding strips, some regis Finishing the tration dots, and some masks must Slidcs - also be procured. The latter are discs of opaque paper in which open- ings of various sizes have been cut. Those intended for contact slides have larger openings than those