| 词条 | Allen Scythe |
| 释义 |
The Allen Scythe, sometimes called the Allen Power Scythe, is a petrol-powered finger-bar mower. It was made from 1935 until 1973 by John Allen and Sons in Cowley, Oxfordshire. The company, formerly the Eddison and Nodding Company, was bought in 1897 by John Allen, who renamed it the Oxford Steam Plough Company, and then renamed it to John Allen and Sons.[1][2] DescriptionThe Allen Scythe does not resemble a hand scythe but serves the same purpose. The engine drives a {{convert|2|ft|m|1|adj=mid|-wide}} or {{convert|3|ft|m|1|adj=mid|-wide}} or 4ft wide toothed blade sliding back and forth horizontally across stationary teeth to produce a scissor action, and also drives two large wheels for forward travel. There are handles to allow the machine to be controlled by an operator walking behind it, controls comprise throttle and clutch. Separate ratchets allow either one or both wheels to be driven. In normal use only one is engaged so that turning is easier. The machines are extremely robust and many from the 1950s are still in regular use. They can be dangerous, as the clutch system only disengages the wheel drive from the engine: the blades cut all the time the engine runs. Later models were available with different attachments, including rotating brushes that replaced the cutting head, air or water pumps and saws or hedge trimmers that drove from the starting pulley side of the engine. EngineJohn Allen and Sons used a number of engine types, the most common being a Villiers two-stroke with magneto ignition and rope start. The engines may fail to start because of ignition problems. The spark should occur when the piston is 3/16 of an inch before top dead centre (TDC) on all Villiers engines except for the Villiers Mk. 11C & 25C which should spark 5/32 of an inch before TDC.[3] Popular cultureEpisode 6 of the BBC Two reality television series Wartime Farm featured an Allen Scythe. Cast members Alex Langlands and Peter Ginn used it to harvest hay in a churchyard.{{citation needed|date=October 2014}}[4] References1. ^{{cite web |url= http://www.ashmolean.org/ash/britarch/aerial-photos/allen-life.html |last=Edbury |first=Christine |date=January 2012 |work=British Archaeology at the Ashmolean Museum: Rationalisation and Enhancement of the Historic Collections |title=Aerial Photographs: Major Allen's Life and Work (1891–1940) |publisher=Ashmolean Museum |accessdate=19 October 2014}} 2. ^Christine Edbury: Highlights of the British Collection: Aerial Photographs - Major Allen's Life and Work (1891-1940). January 2012 at britisharchaeology.ashmus.ox.ac.uk Accessed 3 March 2018 3. ^Allen Scythe User Manual and Villiers 25C Operating Instructions at coalcanal.org Accessed 3 March 2018 4. ^[https://www.bbc.co.uk/programmes/b01ncr7h Episode 6 Wartime Farm "...use some clever 1940s technology..."] at bbc.co.uk Accessed 3 March 2018 Further reading
External links
2 : Agricultural machinery|Two-stroke engine technology |
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