9, 1888.J ^mntxfu %mtvUm. 403 the center of the lever arms has a crank arm at eachend for rotating the shaft, upon which are pinions, onepinion adapted to engage and reciprocate the ap-proaching racks on each side of the ladder frame,while upon one extremity of the shaft a ratchet wheelis secured,… … SOSENBESGS OFFSET F0£ SAWMILL CABfilAOES. forward ends a round, the rounds being in verticalalignment when the ladder is extended or elevated.The ladder is elevated by means of the crank handles onthe transverse shaft, when the sliding rack operates toextend the several sets of lazy-tongs, the…
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