0 |
| 226 | 194.1 | 59.48 |
| 227 | 195.2 | 59.45 |
| 228 | 196.2 | 59.42 |
| 229 | 197.2 | 59.40 |
| 230 | 198.2 | 59.37 |
| 231 | 199.2 | 59.34 |
| 232 | 200.2 | 59.32 |
| 233 | 201.2 | 59.29 |
| 234 | 202.2 | 59.27 |
| 235 | 203.2 | 59.24 |
| 236 | 204.2 | 59.21 |
| 237 | 205.3 | 59.19 |
| 238 | 206.3 | 59.16 |
| 239 | 207.3 | 59.14 |
| 240 | 208.3 | 59.11 |
| 241 | 209.3 | 59.08 |
| 242 | 210.3 | 59.05 |
| 243 | 211.4 | 59.03 |
| 244 | 212.4 | 59.00 |
| 245 | 213.4 | 58.97 |
| 246 | 214.4 | 58.94 |
| 247 | 215.4 | 58.91 |
| 248 | 216.4 | 58.89 |
| 249 | 217.4 | 58.86 |
| 250 | 218.5 | 58.83 |
| 260 | 228.6 | 58.55 |
| 270 | 238.8 | 58.26 |
| 280 | 249.0 | 57.96 |
| 290 | 259.3 | 57.65 |
| 300 | 269.6 | 57.33 |
| 310 | 279.9 | 57.00 |
| 320 | 290.2 | 56.66 |
| 330 | 300.6 | 56.30 |
| 340 | 311.0 | 55.94 |
|___________|__________|__________|

The gain due to superheat cannot be predicted from the formula for the
efficiency of a perfect steam engine given on page 119. This formula is
not applicable in cases where superheat is present since only a
relatively small amount of the heat in the steam is imparted at the
maximum or superheated temperature.

The advantage of the use of high pressure steam may be also indicated by
considering the question from the aspect of volume. With an increase of
pressure comes a decrease in volume, thus one pound of saturated steam
at 100 pounds absolute pressure occupies 4.43 cubic feet, while at 200
pounds pressure it occupies 2.29 cubic feet. If then, in separate
cylinders of the same dimensions, one pound of steam at 100 pounds
absolute pressure and one pound at 200 pounds absolute pressure enter
and are allowed to expand to the full volume of each cylinder, the
high-pressure steam, having more room and a greater range for expansion
than the low-pressure steam, will thus do more work. This increase in
the amount of work, as was the increase in temperature, is large
relative to the additional fuel required as indicated by the total heat.
In general, it may be stated t