John Bower, London:

细节
John Bower, London:
an ornamental and rose-turning lathe, signed, with double mahogany frame, iron bed with extension and pillars for rose-turning cam followers, boxed spring for swash turning, six-drawer cabinet under bed, treadle, crank and flywheel, traversing mandrel headstock on pivots with star nut on vertical slide and six screw hobs, brass pulley with nine-row divided face, tangent screw and segment apparatus and screw-barrel tailstock; a boring collar and stand, hand-rest and two tees, large ornamental slide rest with 9/16-inch square tool receptacle on dovetail slide and large swivelling arc plate, three interchangeable slides (drill spindle/eccentric cutter, rose-cutting with "geed" or "black mark" and square hole for small cutting frames), spherical slide rest with similar fitting and small universal and other cutting frames; plain oval chuck with cam ring fitting lugs on headstock, oval chuck with ratchet nose on interpolating worm gear, straight-line chuck with driving gear, eccentric chuck with worm nose, dome/pencil chuck with point support, two-jaw universal chuck with alternative jaws and twenty-eight brass cup and other work chucks; crane-type overhead gear with weights (c.f. Holtzapffel Vol V fig 83); various keys, handles, calipers and other small accessories; and an electric motor -- 48in. wide, 86in. high overall, centre height 5 3/8in., mandrel nose .78in. x 9.45 t.p.i., circa 1850

拍品专文

John Bower, of 13 King Street, Clerkenwell, London, was a high-class maker of horological wheel-cutting engines, rose engines and the like. He is known to have been working in the period 1830 - 1856, and possibly outside those dates (v. Crom, T.R.Horological Shop Tools 1700-1900, U.S.A., 1980). He seems to have been something of an innovator, as another of his lathes which sold in these rooms (May 24 1990, lot 383) had many differences. The support plate for the pillars is about 12in. diameter, cast in one piece with the bed, which, together with the boxing of the front limb of the headstock and the formation of the cased spring under the bed indicate primary design as a rose engine and not subsequent adaptation. The headstock seems to have some secondary locking as it is currently immovable. The whole machine shows surface rusting to varying degrees, which, with the absence of the rosettes, indicates recent non-use. Most of the equipment is better preserved, having been stored in boxes.