s at our educational insti- The movable section is shown in Fig. 2. It may be attached bolt is arranged to slide in a case on the tongue of the tutions invariably show a full quota of would-be doctors. by a tongue and groove, or by a dovetailed joint. To re- truck, and bas a spring to cause it to… … side. A pawl fitted in a recess in this collar is forced up- ward by a spring so as to engage with the teeth on the nut. IMPROVED LOCK. cleat when the box swings into position, and a lever to de- Fixed to the spindle above the lower bearing is a bevel pin- and Fig. 3a view on a plane perpendicular…
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