430 WHALE-FISHER V. 



light, by turning the cock, by means of a metallic 

 rod terminating near the bed." 



One of these lamps, not larger than a common 

 tea-urn, when filled with oil-gas, condensed 25 times, 

 will afford a flame equal to 5 candles, 6 to the pound, 

 for about 12 hours. A sphere of 12 inches diame- 

 ter, filled in the same way, will, with two argand 

 burners, equal to 12 candles, burn for upwards of 

 6 hours with coal-gas, and 12 hours with oil-gas. 

 A cylinder, 6 inches in diameter, and 2 feet high, 

 exclusive of the hemispherical ends, is calculated to 

 supply an argand burner, equal to 10 candles, for 6 

 hours, with coal-gas, and 12 hours with oil-gas *. 



For facilitating the process of filling these lamps, 

 a reservoir, connected with a gas-work, may be kept 

 constantly charged with condensed gas ; so that a 

 sufficient portion of its contents could be transferred 

 to the portable lamp, with the same ease and dis- 

 patch as filling it with oil. 



Whale-oil, when freed from the incombustible 

 and contaminating animal matters, which are usually 

 dissolved in it, in consequence of putrefaction, is 

 tlien applicable to a variety of purposes, in which 

 the common oil cannot conveniently be employed. 

 The following is a list of some of the processes for 

 refining whale-oil : — 



• Edinburgh Philosophical Journal. — See vol. i. p. 376. 



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