re put in through the lower slot. The blocks being left acts upon the inclined under surface of the projection on the free to move, their inner straight faces accommodate them- hook, causes it to compress the spring, H, and enter the re- selves to the taper of the pick when the latter is inserted,… … the balls on the bars, Fig. 1 shows a portion of a window having sashes mounted strip, D, to the sash, as described, the strip, D, being raised D, descend, the doors, C, will open, and the contents of the as hereinafter described. enough to release the hook, by the action of the cylindrical…
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