' PORTABLE GAS-LAMP. 429 



strong apparatus of copper or brass, of a spherical 

 urn-like, or any ornamental or convenient form, in 

 which gas may be compressed by a forcing pump, or 

 other apparatus, and consumed in burners attached 

 to it, with the same facility and security as an ordi- 

 nary lamp. 



For regulating the escape of the condensed gas, 

 !Mr Gordon has adopted two ingenious contrivances, 

 one by a conical leather valve, and the other by an 

 improvement in the common stop-cock ; either of 

 which admits of such minute regulation, that a 

 flame of any degree of intensity, from a light that 

 is scarcely perceptible, to the full brilliancy of which 

 the gas is capable, may be produced at pleasure, 

 and varied with the greatest facility. 



A particular account of this interesting invention, 

 with an illustrative plate, may be seen in the valua- 

 ble Journal recently commenced in Edinburgh*. 

 " There is one application of the portable gas lamp," 

 say the editors of this work, " to which we attach a 

 very high value. By an extreme tliminution of the 

 aperture, the flame can be rendered so small (in 

 wliich case it is reduced to a blue colour) as to give 

 no perceptible light, and to occasion almost no con- 

 sumption of gas. In this state, the lamp may be 

 used in bed-rooms, and the imperceptible flame may 

 at any time be expanded into the most brilliant 



" Edinburgh Philosophical Journal. — See vol. i. p. 373. 



