| 4.2 "
| " + 90 " | 149 " | 3.6 "
| " + 100 " | 144 " | 3.0 "
| " + 120 " | 136 " | 2.2 "
| " + 140 " | 130 " | 1.6 "
| " + 200 " | 120 " | 0.95 "
| " + 300 " | 110.3 " | 0.4 "
| " + 400 " | 107 " | 0.3 "
+---------------------+------------------+----------------------

_Experiment No. 15_.[3]--The boiler of the engine, Fig. 2, was filled
with 231 kilogs. water of two atmospheres pressure and a temperature of
about 135 deg. Cent.; the soda vessel with 544 kilogs. of soda lye of
22.9 per cent. water and a temperature of 200 deg. Cent., its boiling
point being about 218 deg. Cent. The engine overcame the frictional
resistance produced by a brake. At starting the temperature of both
liquids had become nearly equal, viz., about 153 deg. Cent. The
temperature of the soda lye could therefore be raised by 47 deg. Cent,
before boiling took place, but, as dilution, consequent upon absorption
of steam would take place, a boiling point could only be reached less
than 218 deg. Cent., but more than 153 deg. Cent. The engine was then set
in motion at 100 revolutions per minute. The steam passing through the
engine reached the soda vessel with a temperature of 100 deg. Cent.; the
temperature of the soda lye began to rise almost immediately, but at the
same time the steam boiler losing steam above, and not being influenced
as quickly by the increased heat below, showed a decrease of temperature.
The difference of the two temperatures, which was at starting 1.3 deg.
Cent., consequently increased to 7.2 deg. Cent, after 17 min., the boiler
having then its lowest temperature of 148.8 deg. Cent. After that both
temperatures rose together, the difference between them increasing
slightly to 9.5 deg. Cent., and then decreasing continually. After 2 hours
13 min., when the engine had made 12,000 revolutions, the soda solution
had reached a temperature of 170.3 deg. Cent., which proved to be its
boiling point. The steam from the engine was now blown off into the open
air during the next 24 min. This lowered the temperature of both water
and soda lye by 10 deg. and re-established its absorbing capacity. The
steam produced under these circumstances had of course a smaller pressure
than before, in this way the engine could be driven at reduced st