163

It IB difficult to say how many cubic feet of coal should be allowed for a ton, as
we had no means to ascertain at the time, but will assume it at 40 cubic feet,
hence the following :

2,240X1.7^33

422-i-(40X6)=1.7583 tons per day of 24 hours. Therefore, = 109.7

1,616X24
fte. per horse power per hour.
This does not take into account the difference between the temperature of the
mine and that of the outside which was 3^.
In connection with the above figures it may not be out of place here to state
that the above results are nearly similar to what was found in Ilngland.
It will be seen by referring to the '^Transactions of the North of England Insti-
tute of Mining Engineers," for April 10th, 1808, ps^ 102, that a Mr. Morrison
give a table of experiments that had been conduct^ to compare the work of a
uibal fan and a furnace, when it was claimed that the annual expense was re-
duced in favor of the former £100. Also, the following table exhibiting the ef-
fective power:

Effeotivb Powxb.
Fnmaoe^..
Tans,
96
62



Is
M



T, cwt, qr» lbs
6 17 16
4 8 2 8



P • „

(S2.B
?|S



Lbs,
640
413




Lbs,

101.76
19.82



g"



o ** ^

7rS



H. P.
6.29
20.83



^1

5 o



Oubiefeet.
86,350
64,700



ill



Inches,

1.1
2.05



B. Hughes, general mining superintendent ; Thomas D. Davis, assistant ;
James George, mining boss.
Jersey mine.— This mine is located a short distance north-west of Plymouth,
«id has a tunnel opening into the Bed Ash vein. AU the coals are hoisted by a
slope to the water level, and are brought to the surf^e through the aforesaid
tunnel.
