560 



GAS, COAL 



The following experiments mado -with different burners, by three eminent experi- 

 menters, upon the gas from three different kinds of coal, show the relative values of 

 these burners for the gases produced from the chief varieties of coal used for the 

 manufacture of gas in this country. (For Table I. see opposite page.) 



TABLE II. Results of Experiments on Newcastle Cannel Gas by Mr. A. Wright. 



Table III. contains the results of Mr. Barlow's experiments on gas produced from 

 a mixture of Pelton, Felling, and Dean's Primrose, all first-class Newcastle gas -coals, 

 largely used in London. 



The burners employed in these experiments were the following: 



1st. A No. 3 fish-tail, or union jet. 



2nd. A No. 5 bat's-wing. 



3rd. A common argand, with 15 large holes in a ring '85 inch diameter, and a 

 cylindrical chimney-glass 7 inches high. 



4th. A Platow's registered argand, with large holes in a ring, '9 inch, with inside 

 and outside cone, and cylindrical chimney-glass 8'5 inches high. 



5th. A Biznner patent No. 3 argand, with 28 medium-sized holes in a ring '76 inch 

 diameter, and cylindrical chimney-glass 8'65 inches high. 



6th. A Winfield's registered argand, with 58 medium-sized holes in 2 rings of 29 

 holes in each, the mean diameter being 1 inch, with deflecting button inside and gauge 

 below, bellied chimney-glass 8 inches high. 



7th. A Leslie's patent argand, with 28 jets in a ring '95 inch diameter, and chimney- 

 glass 3*5 inches high. 



8th. A Guise's registered shadowless argand, with 26 large holes in a ring '85 inch 

 diameter, and deflecting button, cylindrical chimney -glass 6*1 inches high, and glass 

 reflecting cone to outside gallery. 



On an average of numerous trials the annexed results were obtained : 



TABLE in. 



It has been stated that one of the conditions necessary for the production of the 

 maximum illuminating power from a pas flame, is the attainment of the highest. 

 possible temperature, and that this condition has been almost entirely neglected in 

 the burners hitherto in use. Dr. Fr.inkl.-md has, however, proved that this condition 

 may be easily secured by employing the waste heat radiating from the gas flame, for 

 heating the air previous to its employment for the combustion of the gas ; and th;it 

 the increased temperature thus obtained his the effect of greatly increasing the illu- 



