. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. Judson chuck in elevation and inpart section. The jaws are forced together or separated bythe screws shown, which screws are turned by a wrench,shown in use on the lower one. Circles 1, 1, 1, 2. 2, 2,scored on the face, enable the workman to secure a sym-metrical adjustment when it is desired. The jaws being independently adjustable, unsymmetrical pieces may bechucked readily and accurately. The wedge-shaped lugwhich connects the nut of each screw with its jaw causesthe same force which drives the ja
. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. Judson chuck in elevation and inpart section. The jaws are forced together or separated bythe screws shown, which screws are turned by a wrench,shown in use on the lower one. Circles 1, 1, 1, 2. 2, 2,scored on the face, enable the workman to secure a sym-metrical adjustment when it is desired. The jaws being independently adjustable, unsymmetrical pieces may bechucked readily and accurately. The wedge-shaped lugwhich connects the nut of each screw with its jaw causesthe same force which drives the jaw a.^rainst the work topress the former more firmly against the face-plate, thusholding the work firmly and snugly. The shell of thisapparatus is usually of iron : the jaws should be of steel;the screws are of wrought iron. A scroll-chuck has asimilar form, but the jaws are moved simultaneously by aspiral feather on the face of a disk within the chucks, if accurately made, always place the piecesymmetrically on the axis, but they cannot be used for un-symmetrical work. Fig. Hortons Horton chuck, Fig. 6, combines tiie distinguishing I moved by a set of geared screws turned by a circular rack,features of both the forms just described. The jaws are ! of wrought iron, sliding in the circular groove cut in the Fig. 7.
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Keywords: ., bookcentury1800, bookdecade1880, bookidjohnsonsnewu, bookyear1881
