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)

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46 McAllister, Optician, 49 Nassau St., New York. INSTRUCTIONS FOR THE OXY-HYDROGEN STEREOPTICONS. Directions for Making the Htdrogen Gas.— For this purpose a Generator is furnished with the apparatus consisting of an outer copper tank, with an inner copper drum. This drum has a perforated false bottom—and in the top of it is screwed a brass tube with stop-cock. Withdraw the copper drum, remove the false bottom, and place within the drum any conveni- ent quantity of Zinc, in small pieces; then replace the false bottom, and the Zinc will be Pour in the outer Copper Tank about 4 quarts of water, and add to that aoout 2 pounds of Sulphuric Acid (common Oil of Vitriol). Stir the mixture with a stick, and let it stand for 15 to 20 minutes, that the acid may be thoroughly and uniformly diluted. Replace the copper drum in the tank, securing it in position by the clamping rods. Into the Purifier pour water to the depth of about 3 inches. Connect the top opening of the Purifier with the Generator, and the side opening with the Gas Bag (by means of the flexible tubes.) Turn on the Cock at the Generator, and also that at the Bag. The Ga« will now begin to pass over, and can be seen bubbling up through the water in the Purifier, and the process will continue until the Bag is full, or until the materials in the Generator are exhausted. , - , „ - After having made the Gas, shut off the Cock at the Bag, and^also that at the Generator; and detach the Purifier. Remove the inner copper drum, and wash it and the Zinc with clean water. Empty the Acid from the Copper Tank—if it is fresh, pour it into a Bottle for future use. But if it is not fresh it is better to throw it away than to run the risk of a failure from poor acid. Wash the Tank with clean water. It is recommended to make the Hydrogen in the open air, to avoid damage to cloth- ing or furniture from the spilling of the acid, which is almost unavoidable. The Gas furnished by the Public Gas Works answers equally as well as pure Hydrogen Gaa. Therefore, in cities and towns where there are Gas Works, the manufacture of Hydrogen can be dispensed with, and the Hydrogen Gas Bag can be filled by making connection between the bag and a gas burner, with a piece of the India Rubber Tubing. DIRECTIONS FOR MAKING THE OXYGEN GAS. (The illustration on page 8 represents the apparatus, the Pressure Board of course 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 Mannanese. 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 np through the water in the Wash Bottle, and the Wash Bottle is now to be connected with the Gas Bag by the piece of India Rubber Tubing, as shown in the illustration. If the Gas comes over too violently, remove the lamp and replace it when the flow of gaa becomes more moderate, and keep it under the Retort until the bubbles cease to come over. You then turn the cock at the Bag—detach the Bag from the Wash Bottle. Next, remove the metal pipe from the Wash Bottle— and, last of all, remove the Spirit Lamp. When the Retort has cooled, wash out the residuum in the Retort, and stand the Retort upside down, that it may be entirely dry before it is used again, as it is absolutely necessary that there shall be no moisture in the Retort while the Gas is being made. With good chemicals the Bag can be filled with Gas in about twenty minutes. Failures often occur from using impure chemicals. To test them, melt a small quantity of the Chlorate of Potash, in an iron spoon, over a Spirit Lamp, and stir into it with an iron wire some of the Black Oxide of Manganese. If the materials are not good an explosion will take place, and a whitish mass with red spots in it will be left in the spoon—if they are pure, there will be no explosion, and the melted mix- ture will soon dry up, leaving a dark gray residuum. For price of Chemicals, etc., see price list on page 48.