[ 368 ]

The distribution and effects of the water on the day of view was as follows :

f

- No. i.Table i. j 2.

Strokes per minute.

Charges per day.

Cube feet of water expended per minute.

*9

23

.267

28

' 18

555

16-I

3 °

780

charges per day

. 71 with

1602 cube feet of water per minute.

N. B. At this time No. 3 was {landing {till.

’When all the furnaces have a full head and fupply of water, the number of ftrokesof the cylinders and bellows per minute, relative to the number of charges per day, asper information of Meffrs. Bests on and Grieve, are in the following table,- and com-paring the feveral heads of water and apertures that thefe muft obtain with the prefent,the expence of water relative to thofe ftrokes and charges will alfo be as thereinSpecified.

Table 2.

1

Strokes per minute. Charges per day. Cube feet of water.

No. 1.

25

28

481

2.

34

20

761

3 -

18

27

1362

4 -

18

3 2 s

CO

V-ri

M

I0 7 i

3456

■Now, comparing the refpe&ive numbers in the fecond table -with thofe of the firft, itappears, that the quantity of water expended to drive an increafcd number of charges,greatly exceeds the proportion in which the number of charges increafe ; for taking thetotals, to advance the charges from 71 to ioj-L, that is nearly as a to 3, the watermuft be increafed from 1602 to 3456, that is more than in the proportion of 2 to 4.Again, in the furnace No. 1, to advance the charges from 23 to 28, the water muft bealmoft doubled, and the difproportion greater or lefs is obfervable' in all the reft.Mr. Grieve reports, that relpedting the furnace No. 3, with the upper gate drawnalone, with a full head of water, it will give 15 cylinders per minute, but with bothgates drawn, in which cafe the expenditure of water will be doubled, the number ofcylinders are no more than 18 5 and as it otherwife appears that the quantity of chargesrelative to each furnace is almoft, but not quite, proportionable to the number of cy-linders, in the furnace alfo the difproportion between the water and the charges is asgreat as in any of the reft, and indeed the proportion, though in fomewhat differentdegrees, appears from the united teftimony of the machines of every conftru&ion.

Obferving