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64 MC INTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. brought to ; T nS ke h y dr °S en or coal gas, and is ught to a focus in the usual manner, by admitting oxygen direct from the gasholder. This method is as simple and cheap If the ox I- calcium, as powerful as the oxy-hydrogen, and more convenient than Sf , GaSollne can be substituted for ether, and the intensity of light and expense of running are then the same as for the hydro-oxy- calcmm, but with the advantage that its use is not restricted to build- ings supplied with house gas, and the apparatus is complete for pro- ducing the more powerful light, with ether whenever it is wanted. t HE McINTOSH-IVES saturator FOB THE PRODUCTION OP The m r t rr;T POWerfUl ^ A Perfect sub- stitute for Hydrogen or Coal-gas. Stored without a Gasholder, and Ready at all Times. Supplied to the Blowpipe by Simple Mechanical Means, without Heat, and ABSOLUTELY WITHOUT DANGER. Previous to the invention of Ives’ saturating chamber, two or three experimentalists in Europe used ether in a “wash-bottle,” forcing oxygen through the liquid in bubbles. The method was not a suc- cess, etause the light flickered badly; the adjustments had to be changed frequently to keep it at its best; the ether chamber could not be disturbed without affecting the light, and to upset it was dangerous mid unsafe ° t0 Vap ° nze the ether ’ but * Proved troublesome The construction of Ives’ Saturator is such that there is no heat no bubbling, no obstruction to the free passage of the oxygen, and it can be disturbed or upset without affecting the light or spilling anv ethei into, the tubing. After one adjustment of the light, it will auto- matically regulate the supply of vapor to correspond to any variation in the supply of oxygen, thereby making the light almost as easy to manage as a coal-oil lamp. This is a very important advantage, which is possessed by no other means for supplying the hydrogen element to the oxy-hydrogen blowpipe. FREEDOM FROM DANGER. Some, wno have not seen this vapor light operated, suppose that the mixture in the Saturator must be explosive, and consequently more or less dangerous. It has been proven that with other kinds or forms of saturating chambers, or with any form which has a filling that is improperly arranged or made of unsuitable material, this supposition