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° Fahr., and expanded to atmospheric pressure. CASE 2.--Where air at 45 lbs. pressure is heated by boiling water to 212° 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° 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. | £ s. d. | £ s. d.| --------------------------------------------------------------------- CASE 1 | 125.4 | 0.627 | 0.596 | 7 1 1 | 6 14 0½| CASE 2 | 140.4 | 0.702 | 0.667 | 7 17 11 | 7 10 0 | CASE 3 | 178.2 | 0.891 | 0.847 | 10 0 5½ | 9 10 5½| CASE 4 | 170.2 | 0.851 | 0.809 | 9 11 5½ | 9 1 10½| CASE 5 | 258.0 | 1.290 | 1.226 | 14 10 3 | 13 15 9 | CASE 6 | 331.8 | 1.659 | 1.576 | 18 13 3 | 17 14 7 | _____________________________________________________________________