Mr. Davies Gilbert’s observations on the steam engine. 37 
and the plan seems worthy of being fully prosecuted. But 
the main hope of augmented power, for still further elevating 
the condition of the human race, by increasing the empire of 
intellect over brute force, and for accelerating that splendid 
career, which, originating with the inventions of the plough 
and of the loom, has acquired such unhoped for rapidity in our 
own times, appears to rest on the application to mechanical 
purposes of some fluid more elastic than the vapour of water, 
according to the suggestion of our President in the Philoso- 
phical Transactions for 1823. 
The following are a few instances selected from one of the 
Monthly Statements, published in Cornwall, of the work 
done by the principal steam engines, July 1826. 
Mine*. 
Engine, and 
the diameter 
of the cy- 
linder. 
Load 
per sq, 
inch, on 
the pis- 
ton. 
Length 
of the 
stroke, 
in the 
cylinder 
No. 
of 
Lifts 
Depth. 
Diame- 
ter of 
the 
Pump. 
Time, 
Con- 
sumption 
of coal, in 
bushels. 
Number 
of 
strokes. 
Length 
of the 
stroke, 
in the 
pump. 
Load, in 
pounds. 
Pounds lifted 
one foot high 
by consuming 
a bushel of 
of coal. 
No. ol 
strokes 
per 
minute 
Remarks, and 
Engineer’s Names. 
Wheal 
Vor 
Trelawny’s 
engine, 
80 inches, 
single. 
Lbs. 
13,3 
Ft. In. 
9 9 
5 
3 
1 
1 
1 
Fms. ft. 
*35 2 
33 3 
11 4 
12 0 
7 0 
Inches. 
*5 
16 
1 6 
9 h 
9 
July 7th 
to 
July 31st. 
2633 
210490 
Ft. In. 
7 0 
89305 
49,975,186 
6,08 
Drawing perpendi- 
cularly 135 fms.; and 
on the underlay 27 f. 
Main beam over the 
cylinder. Two balance 
bobs under ground. 
SrMs and Richards. 
Wheal 
Hope 
60 inches 
single. 
6,78 
9 0 
2 
1 
1 
1 
37 4 
22 1 
5 0 
12 1 
13 
izf 
8 
7 
June28th 
to 
July 29th 
945 
273730 
8 0 
21560 
49,960,794 
6,1 
Drawing all the load 
perpendicularly.Main 
beam over the cylin- 
der. 1 balance bob at 
the surface. Grose. 
[erland 
Manor, 
80 inches, 
single. 
10,9 
9 6 
1 
3 
1 
35 2 
112 4 
23 2 
12 
‘5 
Hi 
June 27th 
to 
July 29th 
2619 
208880 
7 6 
72817 
43 > 55 6 >743 
4,5 
Drawing all the load 
)erpendicularly.Main 
team over the cylin- 
der. One balance bob 
inder ground, and one 
it the surface. Webb. 
'itto. . . 
Fancy, 
80 inches, 
single. 
7.6 
9 6 
2 
1 
1 
72 0 
30 3 
21 0 
Hi 
Hi 
13 
Ditto 
1825 
213670 
7 6 
50890 
44,686,299 
4>6 
Drawing all the load 
perpendicularly. Main 
ream over the cylin- 
der. One balance bob 
inder ground. Webb. 
