4 | 8.95 | 18.22 |
| 189 | 12367 | 9.14 | 18.61 |
| 190 | 11799 | 9.34 | 19.02 |
| 191 | 11243 | 9.54 | 19.43 |
| 192 | 10685 | 9.74 | 19.85 |
| 193 | 10127 | 9.95 | 20.27 |
| 194 | 9579 | 10.17 | 20.71 |
| 195 | 9031 | 10.39 | 21.15 |
| 196 | 8481 | 10.61 | 21.60 |
| 197 | 7932 | 10.83 | 22.05 |
| 198 | 7381 | 11.06 | 22.52 |
| 199 | 6843 | 11.29 | 22.99 |
| 200 | 6304 | 11.52 | 23.47 |
| 201 | 5764 | 11.76 | 23.95 |
| 202 | 5225 | 12.01 | 24.45 |
| 203 | 4697 | 12.26 | 24.96 |
| 204 | 4169 | 12.51 | 25.48 |
| 205 | 3642 | 12.77 | 26.00 |
| 206 | 3115 | 13.03 | 26.53 |
| 207 | 2589 | 13.30 | 27.08 |
| 208 | 2063 | 13.57 | 27.63 |
| 209 | 1539 | 13.85 | 28.19 |
| 210 | 1025 | 14.13 | 28.76 |
| 211 | 512 | 14.41 | 29.33 |
| 212 | Sea Level | 14.70 | 29.92 |
+--------------+----------------+-------------+---------------+

Sea water contains on an average approximately 3.125 per cent of its
weight of solid matter or a thirty-second part of the weight of the
water and salt held in solution. The approximate composition of this
solid matter will be: sodium chloride 76 per cent, magnesium chloride 10
per cent, magnesium sulphate 6 per cent, calcium sulphate 5 per cent,
calcium carbonate 0.5 per cent, other substances 2.5 per cent.

[Illustration: 7200 Horse-power Installation of Babcock & Wilcox Boilers
and Superheaters at the Capital Traction Co., Washington, D. C.]

The boiling point of water decreases as the altitude above sea level
increases. Table 12 gives the variation in the boiling point with the
altitude.

Water has a greater specific heat or heat-absorbing capacity than any
other known substance (bromine and hydrogen ex