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 itself, but about what he called the 20th-century legend of it being Indian, the fame of the trick, which peaked in the 1930s. It is this fame, chapter 8 of his book claimed, which originated from Wilkie's hoax. The magician John Nevil Maskelyne in 1912 reported a possible explanation for the trick from a witness to whom he had spoken. It was suggested that the position of the Sun was crucial to the trick: The jugglers brought a coil of what appeared to be a large rope. As they uncoiled it and held it up it became stiff ; it