Anemometer have accurate wind data under all conditions, including freezing precipitation. Anemometry is also required in monitoring and controlling the operation of wind turbines, which in cold environments are prone to in-cloud icing. Icing alters the aerodynamics of an anemometer and may entirely block it from operating. Therefore, anemometers used in these applications must be internally heated. Both cup anemometers and sonic anemometers are presently available with heated versions. In order for wind speeds to be comparable from location to location, the effect of the terrain needs to be considered, especially in regard to height. Other considerations are the presence of
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,