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)

48 McAllister, Optician, 49 Kassau St., New York. Then stop the Gases at each jet, and turn on a little Hydrogen to each jet (by the cocks marked H), and light it with a match as it issues from the jet. Allow the Hydrogen to burn thus for about two minutes, that the lime cylinders may be gradually heated up ; the Lime Cylinders generally require to be about A inch from the jet, but this will vary with differ-nt Bamples of lime ; the lime carriers then-fore are mounted on a sliding bar for ease of adjustment. Move the Lever of the Dissolving Key to the right, until it is stopped by the Pin. This will send almost all the flow of each Gas to the Jet in the Right Hand Lantern, thus reducing the flame in the Left Hand Lantern to a small size—merely enough to keep up the light. Next, turn on very gradually the Oxygen to the Jet in the Right Hand Lantern (by the cock attached thereto marked 0), aind then increase the flow of each gas very gradually, until the light is brilliant and dazzling. To obtain this requires the gases to be very delicately propor- tioned to eacli other—too much, either of Oxygen or of Hydrogen, will reduce t 1 e intensity of the light and waste gas. When the light is perfect, th re will be scarcely an. flame visible, but the front surface of the Lime Cylinder will be of such a dazzling brightness that the eye cannot look directly at it without injury. Never look, therefore, at the lime itself, hut observe its reflec- tion in the condensing lens, and its condition can be seen exactly. Always follow (his rule. Then move the Lever of the Dissolving Key to the extreme left, and adjust the jet in the Left Hand Lantern, in the same way as directed above. Place a View in the Left Hand Lantern, and adjust the focus. Move the jet back and forth from the Condensing Lenses, and slide it up and down on the rod until the picture on the screen is evenly illuminated, then secure it by the clamping screw. Move the Lever of the Dissolving Key, and transfer the Gases to the jet in the Right Hand Lantern. Place a View in the Right Hand Lantern, adjust the focus, and adjust the jet as directed above. Turn the Lever of the Dissolving Key half way, and each picture will be seen on the screen. Move the Lanierns on the pivot in front, so as to bring both pictures on the same space. Then by moving the Lever of the Dissolving Key from one side to the other, ihereby trans- fering the gases from one jet to the other, the pictures will beautifully dissolve, one into the other—one will fade away, and the other replace it on the screen in a manner which never fails to astonish and delight an audience. While a picture in one lantern is before the audience, and the explanation of it is being made, quietly withdraw the slide from the other lantern, and replace it by another, and dissolve by moving the lever of the Dissolving Key. To show Statuary upon a colored ground, place the colored Glass Slide in one lantern, which will produce a colored screen—then place a Statuary Slide in the other lantern, and move the lever of the Dissolving Key, and the statuary will appear on the colored background, and can be slowly dissolved out in the'same way. The Lime Cylinder must be turned occasionally during the exhibition, to present a new surface —and the proportions of the gases will require adjusting every now and then. At the close of the exhibition, or if it should be necessary during the exhibition to make any change in the position of the Gas Bags, turn off both gases—the Oxygen first, and then t;ie Hydrogen. MATERIALS, Etc. Lime Cvlinlers, prepared from fine Pennsylvania Marble, for Oxyhydrogen Stereoptieons, . in air-tight Tin Canisters, containing 12 limes per canister $* UU Lime Squares, prepared Iroru fine Pennsylvania Marble for Oxy Calcium Stereopticon s in in Tin air-tight canisters, containing'12 limes per canister 2 00 Chlorate of Potash, chemically pure, per pound 7? black Oxide of Manganese, chemically pure, per pound li} Chemicals, ready mixed, in Packages—each package containing proper quantity to make Gas sufficient for an evening's exhibition—per package... 1 W First quality India Rubber Cas Bag, 24 by 30 inches—with Stop Cock, each IH to First quality India Rubber Gas Bag, 30 by 40 inches—with Stop oock, each IA W India Rubber Tubing, per foot, • J*| Improved Lamp to burn Lard, or Lard Oil, with Reflector, each, o uu Glass Chimney, for do 0 r? Coal Oil Lamp, each z p Glass Chimney, for do . j£. Scissors, for trimming Lamps * ," Wicks, for do. per dozen, 0 *jj Muslin Screen, 9 feet square, .„ X„ >< 10 ■< Id DO {= «. w 00 is «« [''['.l.'.'.Y.'','.'.'.'.!.'y.'.2.. 2 ^ °o 27 35 00 Magnesium Lamps, for burning Magnesium Wire $5C 00 Magnesium "Wire, for above Lamps per ounce $3 50 These Magnesium Lamps can be attached to any of the Lanterns or Stereoptieons. They give a brilliant light, but give out an abundance of smoke, which must be led on to a chimney and the expense of burning each Lamp is about $3.00 per hour.