Fundamentals of Quantum Theory of Light (Lebedev Device)

Lebedev's device is a device created by Lebedev for measuring the pressure of light, is a very sensitive twisting dynamometer (twisted scales). Its rolling part was a light frame with light frame with light and black discs to 0.01 mm thick and black discs to 0.01 mm thick on it. The wings were made of metal foil. The frame was suspended inside the vessel, from which the air was thrown out. The light falling on the wings, put on bright and black discs. Miscellaneous pressure. As a result, the rolling moment acted on the frame, which twisted the thread of the suspension. On the corner of the twisting thread, the pressure of light was determined.