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,
Portrait of a Young Woman with a Fan Portrait of a Young Woman with a Fan Portrait of a Young Woman with a Fan is a 1633 portrait painting by Rembrandt. It shows a woman holding a fan, pendant to "Portrait of a Man Rising from His Chair". It is in the collection of the Metropolitan Museum of Art. Rembrandt created this painting as a pendant to the Taft Museum's portrait of a man, probably as a wedding pendant. Only a few pairs of pendant portraits by Rembrandt have survived. This half of the pair came into the collection via the Helen Swift Neilson bequest in 1945. This