1. SOURCES. 217 



SECTION 8. HEAT. 



WEST GALLERY, UPPER FLOOR, ROOM Q . 



I. SOURCES OF HEAT. 



984. Double-Chambered Lamp and Reservoir for heat- 

 ing water or air, or both. There is no blast-pipe, or communi- 

 cation between the chambers. ,/". L. Milton. 



The heat is generated by the combustion of methylated spirit,. and applied 

 on the principle of driving a ring of flame from the holes in the top of the 

 outer chamber against the flame issuing from the inner compartment, thus 

 securing a great and continuous heat. The spirit in the inner chamber alone 

 requires to be lighted. A chambered and tubed reservoir accompanies the 

 lamp. The consumption of 1 oz. of methylated spirit in the outer, and \ oz. 

 in the inner chamber, will produce and maintain, for from 10 to 15 minutes, 

 as great a heat for a vapour-bath as most persons can bear. 



985. George's Patent Gas Calorigen, for warming and 



ventilating apartments. John F. Farwig. 



The peculiarity of construction in this gas stove, which diffuses heat prin- 

 cipally by convection, consists of an outlet so arranged with regard to the 

 inlet (both being external to the apartment) that only so much air passes 

 either way as is required to support and carry off the products of 

 combustion. 



The heat generated by combustion warms a thin coil of sheet iron in the 

 interior of the stove, the coil being in communication at one end with the 

 external atmosphere, and at the other with the apartment ; thus a stream of 

 fresh air, which is warmed in its passage, is drawn into, and equally diffused 

 throughout, the apartment. 



986. Bunsen Burner, improved form, with air jet to increase 

 the temperature of the flame to any required extent without 

 re- adjustment of height or position. Thomas Fletcher. 



In the above, the blow-pipe flame obtained with the blast tube, when confined 

 by the loose cap, is compact and very powerful, owing to the partial mixture 

 of air before the blast begins to act. 



987. Patent Injector Gas Furnace, with blower, for the 

 treatment of refractory substances at very high temperatures. 



Thomas Fletcher. 



This furnace will burn perfectly in the same space any available gas supply 

 from 10 to 50 ft. per hour, or more, if required, giving temperatures in exact 

 proportion. With | inch gas supply, day pressure, starting with a cold 

 furnace, silver can be melted in three minutes, cast iron in eight minutes, and 



