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  2. Nail (fastener) - Wikipedia

    en.wikipedia.org/wiki/Nail_(fastener)

    Double-ended nail – a rare type of nail with points on both ends and the "head" in the middle for joining boards together. See this patent. Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork, shutter, scaffold) nail – used for temporary nailing; nails can easily pulled for later disassembly

  3. Nail (unit) - Wikipedia

    en.wikipedia.org/wiki/Nail_(unit)

    The nail was apparently named after the practice of hammering brass nails into the counter at shops where cloth was sold. [ 2 ] [ 3 ] [ 4 ] On the other hand, R D Connor, in The weights and measures of England (p 84) states that the nail was the 16th part of a Roman foot, i.e., digitus or finger, although he provides no reference to support ...

  4. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    A pair of scales: An instrument for measuring mass in a force field by balancing forces. Balance; Check weigher measures precise weight of items in a conveyor line, rejecting underweight or overweight objects. Inertial balance; Katharometer; Mass spectrometers measure the mass-to-charge ratio, not the mass, of ionised particles. Weighing scale

  5. Claw hammer - Wikipedia

    en.wikipedia.org/wiki/Claw_hammer

    One end is made to fit the hole in the hammer head, then a steel wedge is driven into the wood which forces it to expand and secure the hammer head to the handle. Other handle materials include glass fiber and even carbon fiber. Another type of claw hammer is single-piece forged heat-treated steel where the head and handle are integral. These ...

  6. Mass - Wikipedia

    en.wikipedia.org/wiki/Mass

    The mass of an atom or other particle can be compared more precisely and more conveniently to that of another atom, and thus scientists developed the dalton (also known as the unified atomic mass unit). By definition, 1 Da (one dalton) is exactly one-twelfth of the mass of a carbon-12 atom, and thus, a carbon-12 atom has a mass of exactly 12 Da.

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    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563. Should you need additional assistance we have experts available around the clock at 800-730-2563.

  8. Nail gun - Wikipedia

    en.wikipedia.org/wiki/Nail_gun

    Nail guns vary in the length and gauge (thickness) of nails they can drive. Air compressor supplies air into a nail gun The smallest size of fasteners are normally 23 gauge (0.025 inches or 0.64 millimetres in diameter), commonly called "pin nailers" and generally have only a minimal head.

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