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

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128 THE BOOK OF THE LANTERN. nature, and such as can be found in most households. Here is the list:—An earthenware pot with a cover to it, of about one pint capacity; a glass tumbler ; a preserving- pan or saucepan standing on a tripod, with a spirit-lamp or Bunsen flame beneath it; a thermometer, two glass stirring rods, a square of Berlin-work canvas, an earthen- ware colander, and a dish. In the earthenware pot put the following:— Gelatine ... ... ... ... 110 grains. Potassic Bromide... ... ... 62 ,, (Ten per cent.) Solution of Salicylic Acid in Alcohol, \ ounce. Water ... ... ... ... 2 ounces. I recommend the use of either Autotype, the Swiss, or Henderson's make of gelatine. After being weighed it should be cut up into strips with scissors and placed in the jar with the other ingredients. With a glass rod press down the gelatine into the water, so that every particle of it is wet and softened. Set aside for ten minutes to swell. Now half fill the preserving-pan with warm water, and place the flame beneath it. The thermometer should be placed in the pan, so as to check the temperature, which should not be allowed to rise about 96° Fahr. Place the pot containing the gelatine in the water, taking the precau- tion to put a piece of thick paper beneath it, so that it does not actually touch the heated bottom. The gelatine will very gradually melt, and the opera- tion may be hastened by an occasional stir with the glass rod. Even when it becomes quite limpid, little particles of undissolved gelatine may be floating about in it and these should disappear before proceeding further, or