352 



MR MILNE ON THE MID-LOTHIAN AND EAST-LOTHIAN COAL-FIELDS. 



APPENDIX F.— P. 292. 



Results of Experiments on a small scale of the Gas and Coke produced from 

 VARIOUS kinds of Parrot or Cannel Coal. 



Description of Coal. 



Weight of 

 each charge 

 of Coal. 



Time re- 

 quired for 

 Distillation. 



Produce of 

 Gas. 



Proportion 

 of Gas pro- 

 duced per 

 Cwt. 



Weight of 

 Colie pro- 

 duced. 



Weight of 

 Ashes when 

 Coke con- 

 sumed. 



Weight of 

 Combus- 

 tible Matter 

 in Coke. 



Consump- 

 tion'in one 

 Hoiu: of a 

 Jet-flame 

 3 inches. 



Average of two Charges of~j 

 J. and R. Aytoun's Coal V 

 (Fifeshire), .... J 



Lb. 

 40 



Hours. 



24 



Cubic Feet. 

 204 



Cubic Feet. 

 599 



Lb. 



19^ 



Lb. 

 4 



Lb. 

 151 



Cubic Feet. 

 •65 



Average of two Charges of Mr~l 

 Cuthbertson's Coal (East > 

 Lothian)j J 



40 



24 



192 



537 



204 



2! 



171 



•78 



Average of two Charges of Mr~| 

 Marshall's Gilmerton Coal > 

 (Mid-Lothian), ... J 



40 



2k 



219 



613 



204 



24 



18 



•81 



Average of two Charges of") 

 Halbeath Coal (Fifeshire), J 



40 



24 



216 



604 



^0 



51 



IM 



•72 



Average of two Charges ofl 

 WemyssMethelCoal(Fife- V 

 shire), J 



40 



24 



214 



599 



20i 



6| 



134 



•76 



Average of two Charges of Sir"! 

 Chas.Menteath's Coal from > 

 Mansfield (Dumfriesshire),} 



40 



24 



240 



672 



204 



24 



18 



•67 



Average of three Charges ofl 

 Mr Mercer's Coal, from > 

 Dryden (Mid Lothian), J 



40 



24 



216 



604 



19 



lOi 



8| 



•96 



Average of two Charges of"\ 

 Sir Chas. Mente&th' s'ltough ( 

 or CwWca/ Coal, from Mans- C 



field, ) 







40 



24 



216 



604 



244 



Si 



21 i 



•9 



IVote. — The above experiments were made during the year 1837-8 in the premises of the Edinburgh Gas 

 Company, and I am indebted for the above statement of them to Mr Watson, the Manager. 



Mr Watson remarked, that the illuminating power of the gas is estimated inversely, according to the quan- 

 tity indicated in the last column. But this is evidently a very uncertain test. 



It appears that the results obtained in the manufacture of gas in large quantities, from any particular kind 

 of coal, seldom agree with the results of experiments (such as the above), conducted on a small scale. This 

 discrepancy arises chiefly from the great variation in the quality of the coals, though procured from the same 

 .seam, and out of the same pit. It is generally the best and purest specimens which are selected for experiments ; 

 so that there is necessarily less difference in the qualities of the coal experimented on, than there is in the im- 

 mense supplies furnished to the retorts. But even among the specimens of coal so selected, it is remarkable 

 how great a difierence there is in the constitution of the coal, — arising from the difi'erent proportions in which 

 its elements exist in the same seam. 



