Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . copper is thus removed from the crucible ofthe refining-heavth, the disks being known as rosettes. Quenching-tub. {Black-smithing.) The vesselin which the heated iron or steel from the forge isplunged, in order to cool or tem))er it. Quern. A hand-mill of the ancient pattern. SeeGrixdixg-mill. A Roman quern dug up in Yorkshire, England,about 1710, was found to b
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . copper is thus removed from the crucible ofthe refining-heavth, the disks being known as rosettes. Quenching-tub. {Black-smithing.) The vesselin which the heated iron or steel from the forge isplunged, in order to cool or tem))er it. Quern. A hand-mill of the ancient pattern. SeeGrixdixg-mill. A Roman quern dug up in Yorkshire, England,about 1710, was found to be 20 inches in stone was somewhat dished, and the otherslightly conical. The face had a dress of notches. Quick-match. Cotton-wick is boiled in salt-peter and rain-water for 1 hour; alcohol is added tothe mixture while warm, and it is simmeied for 15minutes, ilealed powder is then added, and thewhole left for 24 hours. The cotton-wick is woundon a reel, and mealed powder sifted over it. It isthen dried. Quick-re-tum Gearing. (Planinti-mcu^kine.)Gear for causing the rapid return of the bed afterthe tool has completed each cut. This is effected (see upper figure) by the pulley a QUICKSILVER. 1848 QUILL PEN. Fig Quick-Return Gearing. ami pinion Ijed fromleft to right,|)reseiiting tliework to thecutting edgeof the tool bythe ruck b, op-erated fromthe pulley cthrough thegeare cc-c^c*.On arriving atthe end of itsmotion, a studon the lathe-bed strikes ahorn, whichshiftsthedriv-ing-belt from c \to «, causingthepinionntoreverse the movement of the gear c*, and turn the bedin the opposite direction, until the belt is shiftedback to its original pulley by a similar device at theother end of tlie machine. Whitworths (|uick return for shaping-machine(lower figures). A spur-wheel a, revolving freelyupon a large fixed overhanging shaft, is attached toa convenient part of the head. Through, but notconcentric with, the shaft, runs a spindles, having aslotted
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