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Supplementary Reading

Text 1

The First Conditioner

In 1902, Willis Haviland Carrier did for indoor climate control what Alexander Graham Bell did for communication and Henry Ford did for transportation. And he profoundly changed the way we live.

While trying to figure out a way to solve a printing company’s humidity problem, this young engineer invented mechanical air-conditioning.

The Sackett-Wilhelms Lithographing and Publishing Company of Brooklyn were having difficulty with its printing jobs during the summer. The paper it used absorbed moisture влагаfrom the air and expanded, so colors printed on humid days didn’t line up with those printed on drier days. The result was blurry images.

Carrier, then 25, theorized he could control the troublesome moisture in the printing plant by chilling the air. He designed a machine that blew air over artificially cooled pipes... and the process controlled both humidity and temperature.

The term ''air-conditioning'' didn’t come into use until 1906, however. That’s when textile engineer Stuart Cramer patented an apparatus that released moisture into the air to condition yarn.

Carrier had called his invention ''Apparatus for Treating Air''. But Cramer’s name was considerably catchier and was the one that eventually stuck for cooling equipment.

Names aside, Carrier’s invention was soon being used in many industrial buildings, including the Celluloid Corporation that made film for the movie industry... a portent of things to come.

The first use of air-conditioning for the sole purpose of human comfort came in 1914, when Carrier designed special equipment for the Charles Gates mansion in Minneapolis, Minnesota. That first home conditioner was 6,10 meters long, 1,83 meters wide and 2,13 metres high!

Carrier also developed Dielene a safer refrigerant than ammonia. This allowed the air-conditioning of public places, not just industrial plants.

In 1922, air-conditioning made its public debut at Grauman’s Metropolitan Theatre in Los Angeles. In 1925, the Rivoly Theatre in New York lured patrons in from the heat with the promise of a ''refrigerating plant'' to keep them cool.

Air-conditioning was real life safer for the movie industry, since business traditionally dropped off during the hot summer month. This way especially true in the South, where theatres advertised ''cool and clear'' weather inside as relief from oppressive heat.

The first department store to be air-conditioned was the J.L. Hudson Co. in Detroit in 1924. That solved the problem of people fainting in the crowed basement on sale days!

The White House got its air-conditional system in 1930.

Yet another invention made it possible to cool skyscrapers. Conventional methods of air-conditioning required large ductwork along walls and ceilings. In 1939, Carrier developed a system that distributed conditioned air at high velocity through small conduits and offered room-by-room control, making it practical for the first time to cool tall buildings.

It was also in the late ‘30s that the availability of Freon, a nonflammable refrigerant, made room air conditioners possible. The units could be made safer and for less money, since Freon was especially suitable for small units with less capacity. Carrier played no part in the development of Freon, but he was quick to make use if it as a pioneer in the field of small units.

Willis Carrier died in 1950, before home air-conditional systems became common. That was a development he likely could not have foreseen back in 1902 when he set out to find a way to improve printing.

Text 2

Static Electricity

We shall give an account of the electrification of bodies in terms of atomic structure. The atoms, normally containing equal numbers of electrons and protons (units of negative and positive charges respectively), are broken up, and electrons pass from one body to another, leaving the former positively and the later negatively charged. This is not the normal condition of matter, and at the first opportunity the positively charged body acquires electrons and the negatively charged body expels electrons, so as to recover the neutral state.

The Electric Current

When a conductor joins two points of different potential, electricity flows from one to the other along the conductor until the potentials are equal.

This process is very rapid, and with good conductors is completed in a fraction of a second. While it lasts, an electric current is said to flow from one point to the other. By convention, the direction of the current is said to be that from the higher to the lower potential, i. e. the direction in which positive charges would travel, but actually, owing to their much greater mobility, it is the negative electrons, which move, and it is their motion, which constitutes the current. It is unfortunate that, before the existence of electrons was thought of the conventional direction of the current should have been wrongly chosen, but it is now too late to alter the convention. The student must bear in mind that when a current is said to flow from A to B, what actually happens is that electrons flow from B to A.

Magnetism

The existence of magnets shows that matter can be active. Everyone knows something of the property of certain pieces of iron steel - and to a smaller extent, cobalt and nickel- by which they can attract other pieces of iron and steel and hold them up against gravity; and there is, in fact, a naturally occurring oxide of iron, knows as "lodestone" which has the same property. If we suspend a magnet by its center so that it hangs horizontally, and then bring the end of another magnet near one of its ends, we find that the suspended magnet is either attracted or repelled; while if we present the other end of the second magnet to the same end of suspended one, the reverse happens-there is either repulsion or attraction. On the other hand, either end of the magnet will attract pieces of iron, which are not magnets.

Magnetic Polarity

We have here a behavior somewhat similar to that of electrified. The magnitude of the force is again far greater than that of gravity; and there is the same attraction and repulsion between bodies affected, and only attraction between an affected and an unaffected body. We therefore speak of positive and negative magnetization if we wish. We do not, however, use these terms, but speak of two ends of the magnet as "north" and "south" poles. The reason for this is that a freely suspended magnet always hangs so that one end points approximately towards the north and the other approximately towards the south, and if we disturb it, it always returns to the position. We therefore speak of the north-speaking poles, and these names are usually abbreviated to north (N) and south (S) poles.

Text 3

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