The descent, of course, is effected by lowering the heat of the cylinder, and letting the temperature abate.
The balloon always retains the same quantity of hydrogen, and the variations of temperature that I produce in the midst of this shut-up gas are, of themselves, sufficient to provide for all these ascending and descending movements.
A calorifere to produce the changes of temperature, and a cylinder to generate the heat, are neither inconvenient nor heavy.
My means of ascent and descent consist simply in dilating or contracting the gas that is in the balloon by the application of different temperatures, and here is the method of obtaining that result.
At one hundred miles the temperature had DROPPED TO 152 1/2 DEGREES
At the depth of two hundred and forty miles our nostrils were assailed by almost overpowering ammonia fumes, and the temperature had dropped to TEN BELOW ZERO
At four hundred miles the temperature had reached 153 degrees.
One hundred and fifty-three degrees had been the maximum temperature above the ice stratum.
Perry looked to his generator; to the great tanks that held the life-giving chemicals with which he was to manufacture fresh air to replace that which we consumed in breathing; to his instruments for recording temperatures, speed, distance, and for examining the materials through which we were to pass.
Only men of iron kept the trail at such low temperatures
, and Kama and Daylight were picked men of their races.
Calm yourself, my worthy friend," replied Barbicane; "the projectile withstood a very much higher temperature than this as it slid through the strata of the atmosphere.
They necessarily consumed a certain quantity of gas, for they were obliged to keep the producing substance at a temperature of above 400@.
As we know that many tropical plants and animals can withstand a considerable amount of cold, many might have escaped extermination during a moderate fall of temperature
, more especially by escaping into the warmest spots.
But we have seen that at Bahia Blanca, which is four degrees southward and therefore with a climate only a very little colder, this same temperature
with a rather less extreme heat, was sufficient to awake all orders of animated beings.
The cracking and booming of the ice indicate a change of temperature