unit 7 (inventions)

Slide1: 

A dryer hair is a small appliance designed to expel hot air on wet hair, accelerating evaporation of the water particles, and dry hair.   the hairdryers were invented in 1920 in Racine, Wisconsin. The first aircraft were launched by companies Universal Motor Company and Hamilton Beach. The idea was born from the combined effects of the discharge of hot air used in the vacuum (invented a few years before) with the motor of the blender (also developed in Racine). The first dryers were bulky, heavy and dismissed little amount of air, but in view of their results quickly gained popularity among consumers. The portable hair dryer is the most popular among the public by presenting some varieties like the dryer folding used for travel. In the professional sector is used, however, the dryer helmet that thanks to their greater power and better distribution of air, allows the realization of molded latest. hair dryer SECURITY • Do not use the dryer inside the Bath or shower, or near an exit Water. • When the dryer is used in the courtroom Bath, after being unplugged Used because the proximity of the water Presents a danger, even if the Dryer is turned off. • To ensure protection Additional it is advisable to install In the bathroom an electrical circuit With a residual current device (DDR) power differential that is not Exceed 30 mA. Consult a Electric qualified installer