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  2. Gauge (firearms) - Wikipedia

    en.wikipedia.org/wiki/Gauge_(firearms)

    Gauge was determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore. Therefore with a 12-gauge, it would take 12 balls of lead of the same size as the 12 gauge ...

  3. Wheelbarrow - Wikipedia

    en.wikipedia.org/wiki/Wheelbarrow

    These wheelbarrows continued in use into the twentieth century, and a good example of this is the 'Piepkar', which is a wheelbarrow on rails, and was found in Sumatra on Billiton Island. [12] However, the lower carrying surface made the European wheelbarrow clearly more useful for short-haul work. [ 13 ]

  4. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    Steel for pipe and tube: Minimum Yield Strength: E: Engineering steels: ... X5CrNiMo17-12-2 X5CrNiMo18-14-3: 316 [8] S31600: X5CrNiMo17 12 2 X5CrNiMo17 13 3 X5CrNiMo ...

  5. Choke (firearms) - Wikipedia

    en.wikipedia.org/wiki/Choke_(firearms)

    A common method of expressing the amount of constriction is by "points". A "point" is equivalent to 0.025 mm (0.001 in) of constriction of the inner diameter of a choke. Hence, 40 points of constriction would correspond to a constriction of 0.040 inch (≈ 1 mm) in the inner diameter of a choke, corresponding to "Extra Full".

  6. .410 bore - Wikipedia

    en.wikipedia.org/wiki/.410_bore

    For example, the barrel of a 12-gauge shotgun is equal to the diameter of a 1/12 of a pound lead ball (0.729 in) and a 20-gauge can fit a 1/20 pound lead ball (0.615 in). Using this method, a .410 bore is equivalent to a (hypothetical) 67-gauge, instead of the incorrectly labeled 36 gauge (0.506) in Europe and South America. [14] [15]

  7. Inner tubing - Wikipedia

    en.wikipedia.org/wiki/Inner_tubing

    Inner tubing may mean: Inner tube, the rubber tube within certain tires; Tubing (recreation), the act of riding an inner tube This page was last edited on 11 ...

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