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The word whirligig derives from two Middle English words: whirlen (to whirl) and gigg (top), [9] or literally "to whirl a top". The Oxford English Dictionary cites the Promptorium parvulorum (c. 1440), the first English-Latin dictionary, which contains the definition "Whyrlegyge, chyldys game, Latin: giracu-lum". [10]
Wheels can also lose traction when surface conditions reduce available traction such as on snow and ice. As an open differential delivers only enough torque to cause the "weakest" wheel to spin, if one drive wheel is stationary on a low traction surface (mud, ice, etc.), the deliverable torque is limited to the traction available on it.
It carries the wallower, Great Spur Wheel and sometimes a Crown Wheel. Wallower The Wallower is a small gear at the base of the upright shaft in a watermill, it is driven by the Pit Wheel. Waterwheel A waterwheel is a source of power for a watermill. It is mounted on the axle and drives the mill by a Pit Wheel or Rim Drive.
Sphagnum is a genus of approximately 380 accepted species [2] [3] of mosses, commonly known as sphagnum moss, also bog moss and quacker moss (although that term is also sometimes used for peat). Accumulations of Sphagnum can store water, since both living and dead plants can hold large quantities of water inside their cells; plants may hold 16 ...
Sphagnum inretortum H.A. Crum (now placed in genus Eosphagnum in Ambuchananiaceae) Sphagnum leucobryoides T. Yamag., Seppelt & Z. Iwats. (now placed in genus Ambuchanania in family Ambuchananiaceae )
Sphagnum australe is a species of Sphagnum found in southeastern Australia. S. australe is very hard to differentiate from other species of sphagnum moss, particularly S. compactum (some forms with short internodes particularly) however the distance along the stems between the fascicles (the bundles of structures) on branches are very variable. [1]
The race leading to the water wheel on a wide stream or mill pond is called the head race (or headrace [2]), and the race leading away from the wheel is called the tail race [3] (or tailrace [2]). A mill race has many geographically specific names, such as leat, [4] lade, flume, goit, penstock. These words all have more precise definitions and ...
Sphagnum cuspidatum is a dominant species in the bogs that it inhabits. [6] In wetlands, they consume methane through symbiosis with partly endophytic methanotrophic bacteria, leading to highly effective in situ methane recycling preventing large-scale methane emission into the atmosphere.