is operated by the individual within the building, who, by means of the screw, C, which presses a chock against Under side or throat, as it is at this point that the strain is principally applied. As a result, and especially in light col- the revolving disk attaclied to tlie barrel on which the… … ty, Dr. Edward Batwell* of Ypsilanti, Michigan, has recen"T sling being hung to the other hook. The operator then grasps the handle, D, with the left hand, and the screw, C, ly patented, April 15, 1873, a metal plate which extends up some distance, and thus prevents the collar from closing on with…
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