Handy man's workshop and laboratory . oughly-turned blank in Fig. 125. The blank is next pressed into this chuck, asshown in Fig. 126. If thechuck is turned out to sucha size that the blank will goin just a little less than halfway, it will stay withouttrouble. Then, using a com-mon chisel and making ascraping cut, the blank isworked down to the marks ofthe first cut, to which this oneis at right angles. In orderthat one may see better howthe work is progressing,without stopping the lathe, itis well to mark the blank heavily around the middle with a softlead pencil. Fig. 127 shows this cut nea
Handy man's workshop and laboratory . oughly-turned blank in Fig. 125. The blank is next pressed into this chuck, asshown in Fig. 126. If thechuck is turned out to sucha size that the blank will goin just a little less than halfway, it will stay withouttrouble. Then, using a com-mon chisel and making ascraping cut, the blank isworked down to the marks ofthe first cut, to which this oneis at right angles. In orderthat one may see better howthe work is progressing,without stopping the lathe, itis well to mark the blank heavily around the middle with a softlead pencil. Fig. 127 shows this cut nearly complete. The blank is nextreversed, and thesame cut made on theother side. If specialaccuracy is required,it may be well to re-peat the operationseveral times; and itis always advisable tostart with the chuckblock thick enough,so that it may be cutback and the holetrued up for each suc-ceeding operation. Insandpapering, if the hole is of just the right size, one can changethe position of the ball without stopping the lathe.—30. Fig. 128—The finished ball CHAPTER III. THE SOLDERING OF METALS AND THE PREPA-RATION OF SOLDERS AND SOLDERINGAGENTS The object of soldering is to unite two portions of the samemetal or of .different metals by means of a more fusible metal ormetallic alloy, applied when melted, and known by the name ofsolder. As the strength of the soldering depends on the natureof the solder used, the degree of strength required for the jointmust be kept in view in choosing a solder. The parts to be joinedmust be free from oxide and thoroughly clean ; this can be securedby filing, scouring, scraping, or pickling with acids. Tha edgesmust exactly fit, and be heated to the melting-point of the latter must have a lower melting-point than either of the por-tions of metal that require to be joined, and if possible only thosemetals should be chosen for solder which form alloys with solder should also as far as possible have the same color andapprox
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