Actual work done:
| Units. | |
| 1,620 lb. of water raised from 60° and turned into steam at 53 lb | = 1,855,900 |
| Loss by radiation and convection | 70,430 |
| 10½ lb. ashes left, say at 500° | 1,129 |
| ———— | |
| Total work actually done | 1,927,459 |
| Unaccounted for | 26,521 |
| ———— | |
| Calculated available work | 1,953,980 |
The unaccounted-for work, therefore, amounts to only 1½ per cent. of the calculated available work.
Sir Frederick Bramwell ingeniously arranged his data in the form of a balance sheet, and showed 253,979 units unaccounted for; but if from this we deduct the work lost in displacing the air, the unaccounted-for heat falls to less than 4 per cent. of the total heat of combustion. These results show how extremely accurate the observations must have been, and that the loss mainly arises from convection and radiation from the boiler.
[Continued from SUPPLEMENT No. 437, page 6970.]
PLANETARY WHEEL-TRAINS.
By Prof. C.W. MACCORD, Sc.D.
II.
