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In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
Headspace for rimmed cartridges is the space between that forward ledge and the bolt face when the action is closed. [1] The cartridge is said to be rimless if the extractor groove is machined into the head of the case so the rim is the same diameter as the adjacent part of the case. Most modern automatic firearms use rimless cartridges.
Eurocode 1: Actions on structures has a definition of "physical clearance" between roadway surface and the underside of bridge element. The code also defines the clearance that is shorter than the physical clearance to account for sag curves, bridge deflection and expected settlements with a recommendation of minimum clearance of 5 metres (16 ft 5 in). [2]
Besides the more common terminology, a gauge made to "maximum" chamber dimensions ought to chamber. A "no-go" is just a bit larger than the maximum chamber dimensions, and represents the smallest size that will not chamber. 66.173.192.96 01:18, 19 December 2005 (UTC) If any page needed a diagram, this is it.
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Headspace or ullage, the unfilled space in a container; Headspace technology, the gaseous constituents of a closed space above liquids or solid emitting and vapors measured using headspace gas chromatography; Headspace (firearms), a chamber measurement; Headroom (photographic framing), a concept of aesthetic composition in imaging
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