Many people claim to disdain technology, but in final week's deadly
heat wave they had been most likely performing their disdaining in an
air-conditioned room. Our ability to remain warm is a legacy of our
fire-loving, Homo erectus ancestors. Staying cool, nevertheless, defied
a technological solution till the Industrial Revolution.
Prior to then, there were only two methods to stay cool in hot weather. One Christian Louboutin Shoes
was to migrate toward the sea or the mountains. The other was to raise
the rate from the evaporation of sweat by increasing air circulation
across the skin. The hand fan is a minimum of five,000 years old.
the 2nd century, a Chinese inventor, Ding Huan, devised the rotary fan.
As large as six feet across and manually powered, it could cool a
entire space. In British India, wealthy homes had a cloth sail called a
punkah attached to the ceiling. A servant in another space, the "punkah
wallah," would move the fan back and forth by means of a rope and
pulleys. These methods, obviously, required the poor to obtain hotter
to ensure that the wealthy might be cooler.
In 1758, Benjamin
Franklin experimented with the rapid evaporation of volatile liquids,
like alcohol and ether, to cool water to a point beneath freezing. He
was in a position lower the temperature to 7 degrees Fahrenheit from
64. In a letter to a buddy, Franklin wrote that the experiment showed
that, scaled up, "one may see the possibility of freezing a man to
death on a warm summer's day."
Sixty years later, the great British physicist Michael Faraday demonstrated that one could use mechanical power to compress a Christian Louboutin Peep Toe volatile substance like ammonia into a liquidand then, by permitting it to quickly evaporate, cool water.
following, John Gorriea young physician living in Apalachicola, Fla.had
an issue to solve. He knew that patients were much more most likely to
survive an illness in cool weather than in hot. So he rigged up pans
full of ice near the ceiling inside a hospital space. The ice would
cool the air about it and, because cold air is heavier than hot air,
would flow downward, more than the patient and then out through holes
within the room's floor. It was the first effective system of air
But ice was expensive in Apalachicola simply
because it had to be imported by ship from the North, so Gorrie started
to experiment with making ice by mechanical indicates. In 1851, he was
granted a patent on a machine that worked on Faraday's principle. He
quit medicine to function on perfecting his invention, but when his
monetary backer died he was unable to carry on and died in poverty in