100 THE ALUMNI JOURNAL 



"The liquid gas is obtained by the dry distillation of raw petroleum 

 and of by-products of the lignite and oil industries. The raw materials 

 are decomposed in retorts by the action of a high temperature; the 

 vapors and gases produced then pass through the tar separators and 

 the cleaner, losing here the easily condensable gases (tar, benzine, etc.), 

 as well as any deleterious and malodorous by-products that may be 

 present. By means of Wolf's patent apparatus, and the use of cold 

 and pressure, a separation of the difficultly liquefiable gases, such as 

 hydrogen, methane, etc., from the more easily liquefiable ethane, pro- 

 pane, pentane, etc., is obtained. These are then liquefied, carburated, 

 and filled into steel transport cylinders provided with a valve and sold 

 as 'liquid gas.' It is easily transportable and utilizable and has a high 

 illuminating and heating power. The prime cost is not greater than 

 that of other kinds of gas produced in small plants. The installation 

 costs are low and the manipulation is simple and without danger. The 

 gases not liquefied are used in the working of the factory." 



It is claimed for the liquid gas that it is non-poisonous, and its 

 explosiveness is about three times less than coal gas. 



Specific gravity of the liquid gas (water: i) about. . 0.568 



Specific gravity of gaseous liquid gas (air: i) about. . 1.021 



I liter gaseous liquid gas weighs (at 0° and 760 millimeters 



pressure) grams. . 1.3201 



I cubic meter (35.314 cubic feet) liquid gas weighs under like 



conditions kilos. . 1.3201 



Maximum heating value per cubic meter of gas (at 0° and 



760 millimeters pressure) thermal units. . 16,046 



Minimum heating value per cubic meter of gas (at 0° and 



760 millimeters pressure) thermal units. . 15.137 



The company's descriptive circular says: 



"The liquid-gas installation consists of the transportable cylinder 

 containing the liquid gas, of a gas tank fitted with a pressure gage and 

 an adjustable safety valve; also of a regulator for adjusting the pres- 

 sure of the gas." 



Heating, Lighting and Welding. 



The advantages and conveniences oflfered by liquid gas present for 

 it a wide field of usefulness. Among the various uses to which it may 

 be applied are the heating and lighting of residences, public build- 

 ings, hotels, and manufactories, and street lighting and cooking pur- 



