Catalogue of stereopticons, dissolving view apparatus, magic lanterns : and list of over 3000 carefully selected views for the illustration of subjects of popular interest. (1867)

McAllister, Optician, 49 Nassau St., New Yoke:. 47 DIRECTIONS FOR SETTING UP AND OPERATING THE OXT-HTDROGEN STEREOPTICON. The OxY-HrDROGEN Stereofticon is packed in a substantial, hinged Packing Case, with Lock and Key, about 24 inches square, and 30 inches long, dovetailed, and planed smooth inside and outside. This contains the Stereopticon, with Gas bags, etc., complete, and also affords suffi- cient space for'the sliders and screen. The lid of the box is made with slip hinges, so that it can be removed in an instant. This lid serves as a platform for the .apparatus, and to the inner side of it is attached the dissolving key, etc. The first thing to be done is to put up the Screen (on page 48 is price list of Screens). The Screens are made with a wide hem, and with loops placed two feet apart all around the lour sides of the Screen. By these loops the Screen can be attached to a wooden frame, though perhaps the most convenient plan is to pass a rope or stout cord through the loops on the upper edge of the screen, ana suspend the rope from the sides of the room or hall; if in a church, the rope can generally be attached to the side windows or galleries. Tie the loop at the upper left hand corner to the cord or rope, and to the loop at the upper right hand corner attach a light cord, by drawing which the Screen can be stretched evenly ; and by the loops on the sides and lower edge, it can be held firmly. Before hanging it up it should be dipped in water, as this will render it closer, and more transparent, and therefore show the views to better effect. The apparatus can be placed either in front of the Screen or behind it, as may be most convenient, depending upon the proportions and internal arrangements of the room or hall. The size to which the picture is to be magnified is next to be determined. The further the apparatus is from the Screen, the larger will be the picture on the Screen. The apparatus is furnished with a set of Low Power, and also a set of High Power Magnifying Lenses, giving about the following results. The Low Power Lenses, with the Screen at the Distance of 10 feet from the apparatus, will make a picture of about 3 feet diameter " " 20 " " " " " " 6 " " 30 " " " " " " 9 " " " 40 " " " " " " 12 " " 50 " " " " " " 15 " And the High Power Lenses, with the Screen at the Distance of 10 feet from the apparatus, will make a picture of about 6 feet diameter " 20 " " " " " " 12 " " 30 '• " " " " " 18 " " 40 " " " " " " 24 " " " 50 " " " " " " 30 " " The apparatus must be at a proper distance from the Screen to produce the views of the desired d.mensions, and elevated from the floor, so that the lenses shall be on a level with the centre of the Screen. Th s can generally be accomplished by placing the packing case on its side on a desk or table, slipping the lid off its hinges, and placing this on the side of the packing case. The lid is intended to serve as a platform, the Dissolving Key, etc., being permanently attached to it, while the views to be used in the exhibition can be conveniently placed within the case. Place the Lanterns on the Platform, each on its own pivot. Set the Safety Bottles in their sockets, having water in each to the depth of about one inch. Place the Oxy-Hydrogen jets in the Lanterns with a cylinder of good hard lime in the lime carrier of each. On the floor in front of the apparatus place the Gas Bags, each under its pressure board. On the Oxygen Bag there should be about 200 pounds weight, and the same on the Hydrogen if house gas is used; if, hovjever,pure Hydrogen (madefrom Zinc and Sulphuric Acid) is used, there should then be from 250 to 300 pounds weight on the Hydrogen. The best way to provide the weights for a traveling exhibition is to procure two good stout Bags, such as are used for grain or salt, and carry these along with the apparatus, and fill them with dirt or sand, which can be thrown out at the close of the performance, and the Bags packed up with the apparatus. With the long flexible tube marked HYD, connect the Hydrogen Bag with the top opening of the Hydrogen Safety Bottle—then connect the side opening of the same with the Dissolving Key, and that again with the cock of each jet maikeo. H. All the flexible tubes which form the Hydrogen connections are distinctly marked h YD at each end. With the long flexible tabe marked OXY, connect the Oxygen Bag with the top opening of the Oxygen Safety Bottle, then connect the side opening of the same with the Dissolving Key, and that again with the cock of each jet marked O. All the flexible tubes which form the Oxygen connections are distinctly marked OXY at each end. Turn the cock at each Bag, and also the cocks at the jets full head on, and set the lever of the Dissolving Key so as to send the gases equally to each jet. If the pipes are all clear and unobstructed, the gases will be seen bubbling up through the w Mer in each of the Safety Bottles. Move the lever of the Dissolving Key from side to side, and notice if the bubbles in each of the Safe.y Bottles continue to come up without interruption (If there is any interruption, the tubes must be detached and examined, as well as the jets, to. ascertain where the obstruction is, and to remove the cause.) Allow the gases to pass through in this way for the space of about one minute, so as to expel all the atmospheric air from the tubes.