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 Difference Does It Make? of the Smiths'. The character Ray Smith in the Jack Kerouac novel "The Dharma Bums" repeatedly says "What difference does it make?" as well as "Pretty girls make graves", the title of another track featured on "The Smiths". The single cover is a photograph of Terence Stamp, taken on the set of the film "The Collector". Originally Stamp denied permission for the still to be used, and some pressings featured Morrissey in a re-enacted scene. In the re-enactment, Morrissey is holding a glass of milk, as opposed to a chloroform pad in the original. However, Stamp later changed his mind,