a steady Light in Coal Mines, J105 



Description of the Lamp, 



(See Plate XV.) 



Fig. 1 . describes the lamp as it appears when ready for 

 use. 



Fig. s. A section of the lamp. 



A. The body of the lamp constructed of copper or japanned 

 iron, terminating in 



B. A conical tube, which carries off the air (deprived of part 

 of its oxygen by combustion) through the water in the cis- 

 tern C. 



D. Is a cistern containing water, in order to prevent the 

 lamp from being over-heated. 



E. The window of the lamp made of very thick glass. 



F. The candle supported upon a tin stand. 



G. A tube furnished with a cock, in order to bring the water 

 to a level within the lamp. 



H. A cistern containing water, which may be drawn off by 

 the cock I. 



K. A tube from the bellows which delivers air for the supply 

 of the lamp, through the water in the cistern H. 



Fig. 3. L. Spare bellows with an elastic tube M which 

 may be adapted to a tube conveying pure atmospherical air, 

 or to a gasometer. Forty gallons of atmospherical air will be 

 sufficient to keep the lamp burning for one hour. 



Fig. 1. N and O, two cocks to draw off the water from the 

 cisterns C and D. 



£ e s 



