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Show hand several filled cylinders. A cylinder cyl-inder contains twenty-two pounds of the gas and coMs about $2.S6. This quantity will supply a fifty-candlo-power burner for ISO hours, po-tbal This illumlnant appears to be cheaper than petroleum. This "blue gas" can, of course, be used for heating and cooking as well as for forging, hardening hard-ening and tempering, and other industrial indus-trial processes. It is a hydrocarbon 'compound, free from carbon-monoxld. and is not poisonous. Its heating effect ef-fect is three and a half times that of ordinary coal gas. The gas Is burned at a pressure of about one Inch of mercury, or IS. 6 inches of water at the burner. Almost any apparatus that is arranged to burn ordinary coal gas or acetylene gas can be altered without with-out much difficulty to burn this, and In such canes all that is necessary Is tn make the connection between the cylinder and thc house pipes through a reducing valve. As regards Its cx-plosibllity cx-plosibllity Professor Gotz of Augsburg reports that, while the range of explo-slblllty explo-slblllty of acetylene gas when mixed mix-ed with air is between 2 and 49 per cent (a range of 47 per cent,) and that of ordinary coal gas is between 6 1-3 and 19 1-3 per cent fa range of 13 per cent), that of "bluo gas" is only between be-tween 4 and 8 pfr cent (a range of i per cent). No special permission from the authorities of tho insurance companies is necessary for its use. GAS DELIVERED IN CYLINDERS. A new form of gas, which Is said to be a brilliant illuminant, is described by the Engineering and Mining Journal Jour-nal as a gas delivered in liquid form, in such shape that it may be used in closed rooms in hanging burners giving giv-ing from fifty to 1000 candle-power. To tiio the. gas, all that is necessary is to pour the liquid from the steel cylinders in which it is delivered in-lo in-lo the gasometer. This is almost as rouvcuient as having one's own gas plant, for one can protect himself against accidents at the factory or delays de-lays in transit by always having on |