$89 Steam Engines in Cornwall.—On Fuel. 
that he has also the sole merit of having first applied it te the 
very important purpose of a safety-lamp, which has evidently 
been imitated in the latest lamps of Mr. George Stephenson: 
“ JosEPH Banks, P.R.S. 
“ Wittram Tromas BRANDE. 
* Cuartes HatcuHerr. 
6 WittiaM Hype WOLLASTON. 
** THomas YOUNG.” 
STEAM ENGINES IN CORNWALL. 
The following were the respective quantities of water lifted one 
foot high with one bushel of coals by thirty-three engines, re- 
‘ported by Messrs. Leans’ in the month of October. 
2 Load per square 
Pounds of water. inch in cylinder, 
25'common engines averaged 21,502,796 various. 
Wooltf’s at Wheal Vor -- 31,690,248 15°5 lib. 
Ditto Wh. Abraham .. 42,639,545 16-8 
Ditto ditto. =. <i, ROD LUT, 4-3 
Ditto Wh. Unity »- 936,450,897 1371 
Dalcoath engine .. «. 44,192,139 1 So 
Wheal Abraham ditto os 938,399,332 10: 
United Mines ditto.. -«- 29,903,937 18-1 
Wheal Chance ditto »- 932,320,346 13°] 
ECONOMY OF FUEL. 
Sir,—The approach of winter has suggested the propriety of 
-thaking generally known the following composition, as likely to 
produce much public benefit, if adopted by the middle and lower 
classes of society. You will at once understand the principle on 
which they will answer as fuel, and of course admit this into your 
valuable journal. 
__ Amisture of sand, clay, and coal-dust or charcoal, or saw- 
dust, made with water into a moderately stiff compound, are all 
the materials required, and these may be obtained almost any- 
-where. The following proportions may be assayed until another 
more preferable may be ascertained by experiment, 
* €oal, charcoal, or saw-dust, or the whole mixed 1 
together ae ae es 5 
Sand of any kind ee ee .e 2 
_ Marl or clay a a a Ee 
These parts may be pecks, bushels, or baskets, or any other 
_Measure at hand. The mass to be made into balls of a coves 
nient size, moderately dried, and the work is accomplished. 
They will not answer to light a fire with; but the fire once 
_brought to nearly a white heat, these balls will support it, be 
_ very durable, produce a heat incomparably more intense than 
commog 
parts. 
