Ceiling fan be used to reduce the stratification of warm air in a room by forcing it down to affect both occupants' sensations and thermostat readings, thereby improving climate control energy efficiency. Punkah-type ceiling fans date back to 500 BC, and are native to India. Unlike modern rotary fans, these punkah fans move air by moving to and fro, and were operated manually by cord. The first rotary ceiling fans appeared in the early 1860s and 1870s in the United States. At that time, they were not powered by any form of electric motor. Instead, a stream of running water was used,
Indian rope trick and fell on the ground behind the juggler who held the rope. Another juggler threw a cloth over the boy and pretended that he was dead. After considerable tom-tomming and incantation the boy began to move, and was eventually restored to life. In 1935, Harry Price suggested that a strong sun and jointed rope could explain the trick. He translated an article by the German magician Erik Jan Hanussen who claimed to have observed the secret to the trick in a village near Babylon. According to Hanussen the spectators were positioned in front of a blazing sun and the "rope"