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McIntosh battery and optical co., Chicago, ill., u. s. a. 81 TO MAKE HYDROGEN GAS. Hydrogen being one of the constituents of water, is produced therefrom by the decomposing action of zinc and sulphuric acid. Make one gallon of a solution of one part of strong sulphuric acid to seven parts of water. As this combination generates considerable heat, it should be prepared in an earthen vessel, and long enough before it is required for use to permit of its cooling; then pour the dilute acid into the generator H. There is attached to the stopper an open basket, in which is placed pounds of scrap zinc. Im- merse the basket in the dilute acid, and at the same instant quickly press the cork into the neck of the generator; the action will soon commence, as shown by the bubbling in the wash bottle. The action should be allowed to proceed for a few moments, so as to be sure that all air has been expelled; then make the connection with the bag, seeing that the key is turned so as to permit the gas to flow. The accompanying cut will show the arrangement of the apparatus. Precautions in Making Hydrogen. —Be careful to see that all the tubes are open ; this is ascertained by blowing through them. Let the wash bottle be filled about half full of water. Expel all air from the bag before commencing to fill it, by rolling it up from the small end. When filled, turn off the stop cock and separate the con- nections. After being used, all gas should be expelled from the hydrogen bag, as the bag would be injured by allowing it to remain GAS BAG. Price of best quality, 30 x 40 Bag, with Stop Cook $22.00 We furnish a very superior quality of gas bag; the material con- sists of two layers of rubber and two of canvas, with all the edges vulcanized together, and bound in a firm and substantial manner to give them extra strength. A deep gusset greatly increases the capacity without adding materially to its weight or bulk when packed. The stop cock is of our own manufacture, and especially adapted for Use with this bag. It is very accurately fitted, so that no leakage of gas can occur. _ A special feature is a separate brass collar, perma- nently fastened in the opening of the bag, into which the stop cock hts, and from which it can be removed in a moment to repair fittings °r to clear out any dirt that may accidentally enter the bag.