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2551. Sheets of Designs. The transparent sheets measure 20-1/2 in. by 16-1/2, and are ready for immediate use. The other articles required are some clear white varnish, some liqueur diaphane, brushes, metal palettes, and ivory sticks. These are all the appliances required. 2552. Calculation of Quantities. To ascertain the quantity of designs required, measure your glass carefully, and then calculate how many sheets it will take (the sheets being 20-1/2 in. by 16-1/2 in. as given above). The sheets are arranged so that they can be joined together continuously, or cut to any size or shape. 2553. Practical Instructions. Choose a fine day for the operation, as the glass should be perfectly dry, and unaffected by the humidity of the atmosphere. Of course, if you have a choice, it is more convenient to work on your glass before it is fixed in the frame. If you are working on a piece of unattached glass, lay it on a flat table (a marble slab is preferable), over which you must previously lay a piece of baize or cloth to keep the glass steady. The glass being thus fixed, clean and polish the side on which you intend to operate (in windows this is the inner side), then with your brush lay on it very equably a good coat of the prepared varnish; let this dry for an hour, more or less, according to the dryness of the atmosphere and the thickness of the coat of varnish; meantime cut and trim your designs carefully to fit the glass (if it is one entire transparent sheet you will find little trouble); then lay them on a piece of paper, face downwards, and damp the back of them with a sponge, applied several times, to equalize the moisture.