keleton. To The device is so simple that overcome these objections and furnish a retreat from this dil- no further explanation is nec- emma is the object of the device under consideration. It was essary to convey a proper idea patented March 12 1867, through the Scientific American Pat- of its… … shaft. The outer surfaces of these seg- or the door. It resembles an ordinary key plate, except that it ments are turned to the same diameter as has a slot cut from one side on a radius struck from the center the inside of the rim of the pulley, A. of its pivot. To one side of the key-plate,…
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