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Although Stephenson’s valve gear consists of two simple eccentrics connected by a curved link its main application between the locomotive’s frames precludes visual study in motion. This video runs in Windows Media, the more recent versions of which allow the option of continuous performance. Please await loading. |
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Courtesy Peter Manning and Allan Wallace |
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The video model is taken from Beyer-Peacock’s order 890; 2-2-2 locomotives for NSW. It is an early example of misusing a launch-type link and although centrally suspended appears not to incorporate correction. As valve travels increased this approach would become unsustainable. |
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