338 



USEFUL PRODUCTS FROM COAL. 



Farther purifi- 

 cation of the 

 gas. 



it is passed into the reservoir; by these means one of the 

 pots is constantly supplying the reservoir with gas, and the 

 lights are always kept burning. One purifier is all that is 

 necessary. The cock V must be shut when either of the 

 covers is taken up to fill the pot again with coal ; and when 

 the elbow.pipe is lifted out of the water-joint, as the cover 

 is attached to it, a plug must be provided to fit into the 

 water-joint pipe the moment the elbow is removed from it, 

 or the gas will rush out of the pipe at the water-joint. But 

 a better way would be, to lengthen the pipe of the water- 

 joints B, and place a large cock under each of them, almost 

 close to the top of the purifier; so that, when one pot was 

 burnt out, by turning the cock it would keep all the gas in 

 the purifier, while the cover was removed. No plug is ne- 

 cessary in this method. When people are very particular, 

 (especially when houses or accompting-houses are to be 

 lighted), and wish all smell to be destroyed, if they are not 

 satisfied with washing it, and still think there is a little smell 

 left, (and very little indeed, if any, will be left), after the 

 washing, a small trough may be added, made in the same 

 way as the purifier, with sheets of iron across to force the 

 gas through the pipe R communicating with it. This trough 

 may be filled with water, with a few lumps of lime put into 

 it, and this water and lime changed often ; on the gas being 

 forced through this lime-water, if there was any remaining 

 smell in it, this would completely take it away, and, as has 

 been before observed, by changing all the waters now and 

 then, and keeping this small trough constantly supplied with 

 clean water and lime, the gas after passing it will ascend 

 the pipes to the lights pure. 



Intended esta- 

 blishment of a 

 large work. 



SIR, 

 HAVING been from home, I was prevented from an- 

 swering your obliging letter until this day. — I am much 

 pleased, that the Society have approved of my specimens 

 produced from pit-coal. I also feel highly gratified and ho- 

 noured with their Reward. I hope to lay before you, in a 

 short time, an account of the establishment of a work, that 

 will be of such magnitude, as will supply this part of the 

 country with the oil or spirit, in sufficient quantity to super- 



sed* 



