Steamroller
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A steamroller is a type of heavy machinery which consists of a large tractor and a heavy cylinder that sits in front of it and functions as the front wheel. Steamrollers are generally used in paving roads, to flatten out the surface.
Most steam rollers are derived from Traction engines, and were manufactured by the same companies.
Many steamrollers are preserved in operating condition, and can be seen in operation during special live steam festivals, where operating scale models may also be displayed.
George the Steamroller is a fictional steamroller featured in the Thomas the Tank Engine and Friends TV Series, originated from the Rev.W.Awdry (View Photo)
A steam roller is also a term for a specific type of smoking pipe, typically used for marijuana (hence James Taylor's "Steamroller Blues"). It consists of an open ended tube with a bowl near one end. The user's hand is placed over the hole nearest the bowl, he or she inhales drawing air through the bowl and its smouldering contents, producing smoke. Near the end of the inhalation the hand is removed so that air flows freely through the tube rather than the bowl thus clearing the remaining smoke from the tube.