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Title: |
1893 Article-Birdsall Engine Co., Steam Traction Engine |
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Source: |
The Engineer Magazine, 08 Sept 1893 pg. 235 |
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Insert Date: |
12/27/2014 8:38:51 PM |
The Birdsall Co.'s engine offers one or two novel points. The traction wheels, as seen in Fig. 28, have open tires which are supposed to relieve the resistance in front of the wheel when going over sandy soil. It does not appear why a continuous full face of the same total width and correspondingly narrower dimensions over outside edges, while giving the same bearing surface, should cause any greater resistance than this open form on any sort of soil. The wheels are built up of wrought and malleable iron. The engine has one cylinder 7½ in. by 9 in., developing about 12-horse power at 230 revolutions. The valve gear is of the Woolf type. The front axle is fastened to the front end of the boiler, and is parallel to the rear axle. It is rigid in the direction of travel. The wheel journals are mounted on hinges at its ends, and can swing in a horizontal plane; they have lever arms which are connected by a rod so that the journals swing together. One of the lever arms is provided with a segmental worm gear, which is operated by a worm on the steering shaft. Thus both wheels turn together, while the axle remains unmoved, as shown in the drawing, Fig. 28. An injector is used for feeding the boiler.
Images courtesy of Grace's Guide:
http://www.gracesguide.co.uk/images/e/eb/Er18930908.pdf |
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1893 Birdsall Engine Co., Steam Traction Engine
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