Anemometer beam exits reflect, or backscatter, the light back into a detector, where it is measured relative to the original laser beam. When the particles are in great motion, they produce a Doppler shift for measuring wind speed in the laser light, which is used to calculate the speed of the particles, and therefore the air around the anemometer. Ultrasonic anemometers, first developed in the 1950s, use ultrasonic sound waves to measure wind velocity. They measure wind speed based on the time of flight of sonic pulses between pairs of transducers. Measurements from pairs of transducers can be combined to yield
What Does the Bee Do? What Does the Bee Do? "What Does the Bee Do?" is the fourth episode of the second season of the HBO television series "Boardwalk Empire", and 16th episode overall. First aired on October 16, 2011, it was written by executive story editor Steve Kornacki and directed by Ed Bianchi. Nucky looks to Rothstein for a port to receive alcohol, since the Coast Guard is blockading Atlantic City. Rothstein instructs Lansky and Luciano to oversee the Philadelphia delivery. Nucky also sends Owen Sleater to bomb Doyle's still. Margaret asks for 'money for the children' from Nucky, which she proceeds to hide