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2. Wood (golf) - Wikipedia

   en.wikipedia.org/wiki/Wood_(golf)

   A wood is a type of club used in the sport of golf. Woods have longer shafts and larger, rounder heads than other club types, and are used to hit the ball longer distances than other types. Woods are so called because, traditionally, they had a club head that was made from hardwood, generally persimmon, [1] but modern clubs have heads made from ...

3. Warrington hammer - Wikipedia

   en.wikipedia.org/wiki/Warrington_hammer

   Head – The metal top of the hammer, typically made of steel. Face – The round striking surface on the end of the hammer. Peen – The chisel-like edge on the reverse side of the face.

4. Spindle (tool) - Wikipedia

   en.wikipedia.org/wiki/Spindle_(tool)

   In machine tools, a spindle is a rotating axis of the machine, which often has a shaft at its heart. The shaft itself is called a spindle, but also, in shop-floor practice, the word often is used metonymically to refer to the entire rotary unit, including not only the shaft itself, but its bearings and anything attached to it (chuck, etc.).

5. Machine taper - Wikipedia

   en.wikipedia.org/wiki/Machine_taper

   A machine taper is a system for securing cutting tools or toolholders in the spindle of a machine tool or power tool. A male member of conical form (that is, with a taper) fits into the female socket, which has a matching taper of equal angle. Almost all machine tool spindles, and many power tool spindles, have a taper as their primary method ...

6. Janney coupler - Wikipedia

   en.wikipedia.org/wiki/Janney_coupler

   The diagram from Beard's 1897 coupler patent [1]. Janney couplers were first patented in 1873 by Eli H. Janney (U.S. patent 138,405). [2] [3] Andrew Jackson Beard was amongst various inventors that made a multitude of improvements to the knuckle coupler; [1] Beard's patents were U.S. patent 594,059 granted 23 November 1897, which then sold for approximately $50,000, and U.S. patent 624,901 ...

7. Lignum vitae - Wikipedia

   en.wikipedia.org/wiki/Lignum_vitae

   Lignum vitae is hard and durable, and is also the densest wood traded (average dried density: ~79 lb/ft 3 or ~1,260 kg/m 3); [4] it will easily sink in water. On the Janka scale of hardness, which measures hardness of woods, lignum vitae ranks highest of the trade woods, with a Janka hardness of 4,390 lbf (compared with Olneya at 3,260 lbf, [5] African blackwood at 2,940 lbf, hickory at 1,820 ...