------------------------------------------------

Revenue at 5d. | | | | | |
per 1000 cub. ft.| 22,126 | 43,522 | 64,282 | 84,426 | 103,971 |
(average) | | | | | |
Profit |12.18 p.ct.|20.06 p.ct.|23.54 p.ct.|25.22 p.ct.|26.16 p.ct.|
|= 10,046 | = 25,014 | = 39,338 | = 52,837 | = 65,875 |
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TABLE II.--_Cost of Air Power in Terms of Indicated Horse Power_.

Abbreviated column headings:

Qty. Air: Quantity of Air at 45 lbs. Pressure required per Ind. H.P. per
Hour.

Cost/Hr.: Cost per Hour at 5d. per 1000 Cubic Feet.

Cost/Hr. w/rebate: Cost per Hour with Rebate when Profits reach 26 per
Cent.

Cost/Yr.: Cost per Annum (2700 Hours) at 5d. per 1000 Cubic Feet.

Cost/Yr. w/rebate: Cost per Annum with Rebate when Profits reach 26 per
Cent.

Abbreviated row headings:

CASE 1.--Where air at 45 lbs. pressure is re-heated to 320 deg. Fahr., and
expanded to atmospheric pressure.

CASE 2.--Where air at 45 lbs. pressure is heated by boiling water to
212 deg. Fahr., and expanded to atmospheric pressure.

CASE 3.--Where air is used expansively without re-heating, whereby
intensely cold air is exhausted, and may be used for ice making, &c.

CASE 4.--Where air is heated to 212 deg. Fahr., and the terminal pressure is
11.3 lbs. above that of the atmosphere

CASE 5.--Where the air is used without heating, and cut off at one-third
of the stroke, as in ordinary slide-valve engines

CASE 6.--Where the air is used without re-heating and without expansion.

_____________________________________________________________________
| Qty. Air | Cost/Hr. | Cost/Hr. | Cost/Yr. | Cost/Yr. |
| | | w/rebate | | w/rebate |
| Cub. Ft. | d. | d. | L s. d. | L s. d.|
---------------------------------------------------------------------
CASE 1 | 125.4 | 0.627 | 0.596 | 7 1 1 | 6 14 01/2|
CASE 2 | 140.4 | 0.702 | 0.667 | 7 17 11 | 7 10 0 |
CASE 3 | 178.2 | 0.891 | 0.847 | 10 0 51/2 | 9 10 51/2|
CASE 4 | 170.2 | 0.851 | 0.809 | 9 11 51/2 | 9 1 101/2|
CASE 5 | 258.0 | 1.290 | 1.226 | 14 10 3 | 13 15 9 |
CASE 6 | 331.8 |