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MAGIC LANTERNS, STEBEOPTICONS, ETC. 19 General Directions for the Use of the Magic Lantern. The following directions are intended merely as a guide to those unacquainted with the management of the Magic Lantern. Practice will soon suggest to the operator many methods of rendering the exhibition a pleasant and profitable amusement. The lamp should be carefully trimmed, and filled with the best oil, the flame to stand as high as possible, so that it does not smoke. The greatest cleanliness should be observed with the lamp, and when not in use the oil should be drained out. All the lenses should be taken out previously to each ex- hibition, and carefully wiped out with a soft muslin or linen cloth. The room being fully darkened, the lantern should be placed upon a table, about six or eight feet from a white wall, or a white sheet suspended on a wall; or it is frequently preferable to make use of a muslin screen stretched on a frame, the lantern being on one side and the spectators on the other ; and it is recommended to wet the screen, that it may be drawn tighter, and also rendered more transparent. To make a waxed muslin screen, mix turpentine and white bees- wax, in the proportion of two parts wax and one part turpentine ; heat it over a fluid lamp until all is dissolved ; then, in a warm room, apply it with a painter's brush over the screen, and after- wards smooth the screen with a common iron, heated a little. The screen should be stretched on a frame. This makes an excellent screen when you want to have your lantern behind the screen ; the glare of the lamp does not come through ; but it cracks and becomes yellow if kept folded up, gets dirty very easily, and is troublesome to prepare. The lamp having been lighted and placed in the lantern, close the door of the lantern, and move the lamp backwards or for- wards, until a perfect circle is formed ou the wall or screen ; the lamp is then known to be in its proper position. Much depends upon this. The sliders are placed in the slit in front of the lantern, with the picture inverted, where they will be firmly held and kept in the central line of the lenses by an 'mproved slide spring and stop, and the focus adjusted by moving the front lenses. The farther