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A rowlock [1] (UK: / ˈ r ɒ l ə k /), sometimes spur (due to the similarity in shape and size), oarlock (American English) [2] or gate, is a brace that attaches an oar to a boat. When a boat is rowed, the rowlock acts as a fulcrum for the oar. [3] On ordinary rowing craft, the rowlocks are attached to the gunwales.
The oarlock also allows the rower to rotate the oar blade between the "square" and "feather" positions. Also historically called 'Rowing Gate' by some manufacturers. Outboard The length of the oar shaft measured from the button to the tip of the blade. Outrigger (See Rigger) Pin The vertical metal rod on which the rowlock rotates. Pogies/poagies
The calculations are simpler for the Class I perspective. The mechanical advantage of the oar depends on the length of the oar from the oarlock to the blade, compared to the length from the oarlock to the rower's hand(s). The further away from the oarlock the blade is, the more difficult it is to row and the more distance each stroke will move. [4]
An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
Shackle: a U-shaped fitting secured by a removable pin for securely connecting chains, lines, and other fittings. Known as a "snap shackle" when fitted with a spring-loaded pin. Sheave box: a plastic or stainless steel box that holds a pulley that is fixed in position as on a mast head. Sheer: the generally curved shape of the upper hull. It is ...
To accommodate three levels of oars, rowers sat staggered on three levels. Arrangements of the three levels are believed to have varied, but the most well-documented design made use of a projecting structure, or outrigger, where the oarlock in the form of a thole pin was placed.
A tuning pin is a tuning peg with a detachable grip, called a tuning lever. The socket on the tuning lever fits over the pin and allows it to be turned. Tuning pins are used on instruments where there is no space for a knob on each string, such as pianos and harps. Turning the peg or pin tightens or loosens the string.
19th-century needlecase of bone, lead, wood, glass pearls, amber, leather, bronze, and iron. Nivkh or Evenki people, Amur River basin, Russia.. A needlecase or needle case is a small, often decorative, holder for sewing needles.