. A treatise on steel : comprising its theory, metallurgy, properties, practical working, and use. ould destroy its solidity. 272. The moulds used for makingthe smelting potsfor steel, are of brass; cast iron would be too heavy,and iron too expensive. Theannexed figure shows their size varies with the quan-tity of steel to smelt. Generallythe depth is metre, the dia-meter in the clear metre,and the thickness metre forthe sides, and metre for thebottom; they have two projectinghandles for lifting. The bottom,which is concave, is perforatedwith a hole of about
. A treatise on steel : comprising its theory, metallurgy, properties, practical working, and use. ould destroy its solidity. 272. The moulds used for makingthe smelting potsfor steel, are of brass; cast iron would be too heavy,and iron too expensive. Theannexed figure shows their size varies with the quan-tity of steel to smelt. Generallythe depth is metre, the dia-meter in the clear metre,and the thickness metre forthe sides, and metre for thebottom; they have two projectinghandles for lifting. The bottom,which is concave, is perforatedwith a hole of about metrediameter, and receives a movablebottom perforated with a to metre movable bottom has a convex surface, whichcorresponds as nearly as possible with the bottom ofthe mould, and a flat surface upon which the potrests. The mould stands firmly in a hole made in thefloor, and room is left to allow the workman toreach the handles. In order to give more solidityand correctness, the bottom and sides of the hole arelined with strong pieces of wood. At the bottom is 15*. 174 TREATISE ON STEEL. also a perforation of to metre bore, whichcorresponds exactly to that of the movable is used for passing the centre spindle of the mould thus prepared is smeared with oil, andthe workman throws into it a cylindrical lump ofclay, which he presses firmly with a kind of pestle(see figure 6). Afterwards, a centring board madeof wood, lined with iron, and with a hole equal tothat of the movable bottom, is inserted into themould. Through the hole of this centring board a Fig. 6.
Size: 1050px × 2380px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookidtreatiseonst, bookyear1868
