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APPENDIX. 
Oji the Composition and Calorific Poicer of Llangennech Coal. 
During the trials at Wolverhampton, in 1871, the question 
arose, " What is the relative value of the Llangennech coal, used 
for many years past in the Society's trials of steam machinery, com- 
pared with other first-class steam-coal?" Mr. Menelaus, C.E., 
of Dowlais, one of the Engineer Judges of Implements, having 
kindly offered to have an analysis made of the coal, the Consult- 
ing Engineers, on the part of the Society, gladly accepted his 
offer, and selected an average sample from the stores for the 
purpose. Mr. Menelaus placed it in the hands of Mr. Snelus, 
iinalytical chemist at the Dowlais Iron-works, and, on receipt of 
his Report, forwarded it to Messrs. Eastons and Anderson. As 
the comparative value of the fuel used is necessarily of interest 
to numerous members, the Report, and a few remarks by Mr. 
Menelaus on the coal, are, by his permission, published in 
extenso : — ■ 
"Laboratory, Dowlais Iron and Steel Works, 
" August 25th, 1871. 
" Report upon Sample of Llangennech Coal used by the Royal 
Agricultural Society at Wolverhampton. 
" To William Menelaus, Esq. 
" Dear Sir, — I have completed the examination of this 
sample of coal, and find it to contain, by ultimate analysis — 
Carbon 81-97 
H}'drogen 4'2G 
Nitrogen . . .. : 1*45 
Sulphur -42 
Oxygen 3'.50 
Ash 5-40 
100^00 
It yields 86'7 per cent of coke. 
^' The ash is of reddish colour and consists of — 
Peroxide of Iron 36'Gl 
Silica 13-71 
Alumina 11'61 
Oxide of Manganese '50 
Lime 16-92 
Magnesia 13-37 
Sulphuric Acid 4-31 
Phosphoric Acid -91 
Alkalies, loss, &c 2-06 
100-00 
