The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . >I, Exeter type. B, Joiners hammer. C, Canterbury claw hammer (these are wood-workershammers). D, Engineers hammer, ball pane. E, Ditto, cross-pane. ., ,;. j FlC. 27.—Hammers. F, Ditto, straight pane. G, Sledge hammer, straightpane. H, Ditto, , K, L, M, Boiler makers , Scaling hammer^ Moulding Too^s.—ThisIS a^t-dup of tools which, actuated eitherby simple pressnre or percussively. mould, shape and model formsin the sand of the moulder, in the melal of the smith, and in
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . >I, Exeter type. B, Joiners hammer. C, Canterbury claw hammer (these are wood-workershammers). D, Engineers hammer, ball pane. E, Ditto, cross-pane. ., ,;. j FlC. 27.—Hammers. F, Ditto, straight pane. G, Sledge hammer, straightpane. H, Ditto, , K, L, M, Boiler makers , Scaling hammer^ Moulding Too^s.—ThisIS a^t-dup of tools which, actuated eitherby simple pressnre or percussively. mould, shape and model formsin the sand of the moulder, in the melal of the smith, and in presswork. All the tools of the moulder (fig. 28) with the exception ofthe rammers and vent wires act by moulding the sand uneon; 73(!t ??-odc. B ^ V .•ntlo ?: ni \2 ??? ? C. no boiiujw. .;.. .. ^.. •? ..., ... Fig. 28.—Moulding Tools. irr. /, Square trowel. E, Flange bead. J, Button sleeker. B, Heart trowel. F, Hollow bead. K, Pipe smoother. C, D, Cleaners. G, //.Square corner sleekers. by pressure. Their contours correspond with the plane and curvedsurfaces of moulds, and with the requirements of shallow and deep\yojk. They are made in iron and brass. The fullers, swages andflatters of the smith, and the dies used with hammer and presses,all mould by percussion or by pressure, the work taking the counter- f)art of the dies, or of some portion of ihem. The practice of dieorging consists almost wholly of moulding processes. Tool Steels.—These now include three kinds. The commonsteel, the controlling clement in which is carbon, requires to behardened and tempered, and must not be overheated, about 500° the highest temperature permissible—the critical tempera-ture. Actually this is seldom allowed to be reached. The dis-advantage of thi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
