late from turning thenut by any movement it may have impartedto it. When a spherical or disk roller is usedwithout a washer, and with but one nut, theface of the object is grooved to correspondwith the nut. With nuts having annulargrooves, Fig. 5, the nut can be screwed nearlyto place, and the… … HAMMONDS KEEL FOR SUBMARINE BOATS. longitudinal slot), rest in the bottom edges of the slots,thus holding the cover. When the box is to be opened,the fingers are placed in the V-shaped plates, F, formedon the lower end of a pivoted lever ; the lever is movedaway from the box, thereby pressing the…
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