1

　　So a thick head of hair can stay wet for hours. Not a big deal in hot July, but imagine having to endure that in January. The most advanced hair drying option at the time was a towel and fire.

　　Eventually, the discovery of electricity brought about a bit of a solution ?in the early 20th century, women attached pipes to the 揵lower?side of the vacuum ( ca真空) cleaner and use it to blow-dry their hair.

　　2

　　The earliest hair drying tool was invented in 1890.

　　3

　　A soft hat was placed on the woman’s head and attached to a chimney pipe. The pipe was attached to a stove fitted with a fan that would direct the air down the pipe to dry the hair.

　　The 1920s saw the first hair dryer as we recognize it today. It was electric and almost like our modern version. It was more convenient and quicker than the vacuum and the chimney pipe.

　　4

　　It was only about 100 watts (瓦特), compared to the 2000-watt dryer of today.

　　In the 1960s, the cover could be made from lightweight plastic, and the motors had become efficient enough to produce 500 watts.

　　5

　　Over the years, motor efficiency improved, materials became lighter and new heating elements were developed, bringing us the hair drying experience today.

　　A. It helped, but only a bit, and the air was cold and difficult to direct.

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