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, No. 418. Oxy-Calcium Lantern, Japanned Case, with McAllister's Improved Adjustable Oxy-Calcium Jet. Condensing Lenses 3J inches in diameter—High Power and Medium Power Magnifying Lenses, with Brass Rack adjustment, for focussing. McAllister's new Slide Spring and Stop. Retort, on Iron Stand, with Spirit Lamp, Purifier, India Rubber Gas Bag, and flexible India Rubber Tubing, for the Oxygen $ 80 00 No. 419. Same as No 418, with-Achromatic Magnifying Lenses $95 00 No. 420. Oxy-Calcium Lantern, Japanned Tin Cas?, with McAllister's Im- proved Adjustable Qxy-Calcium Jet. Condensing Lenses 4 inches in diameter—High Power and Medium Power Magnifying Lenses, Tin Sliding Tube adjustment, for focussing. McAllister's new Slide Spring and Stop. Retort, etc., for the Oxygen $75 00 MANAGEMENT OF TEE OXY CALCIUM APPARATUS. Fill the Reservoir (A, fig. 121 page 8) to within an inch of the top, with the best alcohol, and have a good thick wick 3 or 4 inches long, in the tube of the lamp, projecting about half an inch, and trimmed even. p^-The alcohol should always be of at least 90 per ccnt.purity. A percentage Hy- drometer is furnished with each apparatus, with instructions for use; by which the purity, of the alcohol can be tested when purchasing. "Hs^ A cylinder of hard unslacked lime must next be placed in the lime-carrier, immediately in the rear of the flame, and is to be thoroughly heated by the flame before the oxygen is turned on. (If the oxygen is turned on too soon, the lime will crack from the sudden increase of heat.) Having the Bag of Oxygen in a convenient position on the floor, in front of the apparatus, place about 150 pounds weight on the Pressure Board, and make the attachments with the flexible India Rubber Tubing. (In Nos. 416 to 42.t the connection is made directly from the bag to the jet, but in Nos. 410 to 415 the bag is connected with the jets by the medium of the Dissolving Key.) The stop-cock at the bag should now be turned on, and the flow of gas regulated by the small stop-cock attached to the jet. The wick of the lamp must be spread out slightly, so as to leave a free passage for the gas from the jet through the flame—the smallest fibre of the wick in front of the jet will prevent the flow of the gas, lessen the light, and cause a slight hissing noise. The lime is next to be adjusted by sliding the lime-carrier to or from the flame, and moving the lime cylinder up or down, until the light is most brilliant. It merely remains to place a view in the lantern, adjust the focus, and move the jet backward or forward, and center it until there is an equally intense illumination over all parts of the mag- nified picture. The jet once in its position is to'be held fthere by the centering and elevating screws. The Dissolving effect in the Stereopticons is produced by moving the lever ot the Dissolving Key, transferring the Oxygen from one lantern to the other, thus causing the light to increase in one lantern, in the same proportion as it decreases in the other lantern, and the paintings will gradually and beautifully dissolve. Each Lantern of the Stereopticon turns upon a pivot in front, and the Lanterns are to ba inclined apart at the rear, to such an angle that the circle of light from each shall fall precisely upon the same space on the Bcreen. DIRECTIONS FOR MAKING THE OXYGEN GAS. {The illustration on page 8 represents the apparatus, the Pressure Board, of eourse being removed when making the Gas.) Place in the Retort 16 ounces of Chlorate of Potash, in coarse powder, and add to it 6 ounces of Black Oxide of Manganese. Shake the Retort, that the ingredients may be well mixed. Next, blow through all the pipes and connections, so as to satisfy yourself that there is nothing to obstruct the free passage of the Gas. Pour about one pint of water into the wash bottle, and fit the metal pipe into the opening at the top ; this pipe is connected by the India Rubber Tubing with the longer metal pipe which you now fit into the top of the retort. Press these pipes, and the fittings will be completely gas-tight. Light the spirit lamp under the Retort, and in a few minutes bubbles of gas will begin to come up through the water in the Wash Bottle, and the Wash Bottle is now to be connected witU the Gas Bag by the piece of India Rubber Tubing, as shown in the illustration,