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.
Within 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
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.
Soon 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 conditioning.
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 1855.