This page has been validated.
202
THOMSON ON CARNOT'S
TABLE A.
Various Engines in which the Temperature of the Boiler is 140° C. and that of the Condenser 30° C.
Theoretical Duty for each Unit of Heat transmitted, 440[1] foot-pounds.
| Cases. | Work produced for each lb. of coal consumed. | Work produced for each lb. of water evaporated. | Work produced for each unit of heat transmitted. | Percentage of theoretical duty. |
|---|---|---|---|---|
| Ft.-lbs. | Ft.-lbs. | Ft.-lbs. | ||
| (1) Fowey Consols experiment, reported in 1845 | 1,330,734 | 156,556 | 253 | 57.5 |
| (2) Taylor's engine at the United Mines, working in 1840 | 1,042,553 | 122,653 | 198.4 | 45.1 |
| (3) French engines, according to contract | ......... | 98,427 | 159 | 36.1 |
| (4) English engines, according to contract | 565,700 | 80,814 | 130.8 | 29.7 |
| (5) Average actual performance of Cornish engines | 585,106 | 68,836 | 111.3 | 25.3 |
| (6) Common engines, consuming 12 lbs. of best coal per horse-power per hour | 165,000 | 23,571 | 38.1 | 8.6 |
| (7) Improved engines with expansion cylinders, consuming an equivalent to 4 lbs. of best coal per horse-power per hour | 495,000 | 70,710 | 114.4 | 26 |
- ↑ [Note added March 15, 1881. Total work for thermal unit, 1390
(Joule), 377.1 corrected by the dynamical theory, March 15, 1851.
377.1 = .2713 × 1390,
253 = .1820 × 1390 = × 1390.]
