by Troughton, of Lon- When the stopper-body has been properly placed don, and others, consist principally of a circle or wheel within the tube, the threaded part of the key extends supported upon a perpendicular axis and moved hy a through a cap having a body which enters the flue tangent screw… … the action of the spring-pressed sliding-rod carrying pressure. The moving screw has a drum-head graduated to the friction-roller. In the latter instance, the friction: 120, so that the automatic movement may be arranged roller engages the upper end of the holder, the sliding- peripheral groove to…
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