The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . Fig. 83. referred to the lecture on The Care of the Fire, which comesa few pages farther on. The operation of scarfing preparesthe two ends which are to be united so as to have a single sur-face of contact, which should be nearly a plane oblique to theaxes of the ends. A shoulder rarely welds, and hence is asource of weakness. Several attempts may be necessary to 96 THE SECOND, OR MIDDLE YEAR. [Chap. m. make the first weld. The third link shou
The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . Fig. 83. referred to the lecture on The Care of the Fire, which comesa few pages farther on. The operation of scarfing preparesthe two ends which are to be united so as to have a single sur-face of contact, which should be nearly a plane oblique to theaxes of the ends. A shoulder rarely welds, and hence is asource of weakness. Several attempts may be necessary to 96 THE SECOND, OR MIDDLE YEAR. [Chap. m. make the first weld. The third link should be well done. Thewelding of the two ends of one piece is much easier than thewelding of two separate pieces. If^o. 16. (Fig. 84.) Ribbed handle. Stock, a % rod, about30 long. The rod is bent back and forth hot, till it is Fig. 84. the cross-section being four tangent circles whose centers are atthe vertices of a square; then the ends are welded, embracing theparts uniformly. Tlie bundle is heated to a red heat, and the rods bent out by upsetting thebundle. Then again at a proper heat^Avhile one end is held in a vise, theother end is turned 270°. No. 17. [Fig. 85.) Welded , I round rod. As this is pre-liminary to No. 18, the free end shouldbe long enough for the complete two inches of the end is drawnout to nearly four inches, bent round,and wielded to the shoulder on thebody of the rod. The danger ofburning is so great that one shouldaim at | in thickness instead of ^^as the drawing shows. The exerciseis not an easy one. No. 18. (Fig. 86.) Chain stock is furnished by No. shaft just below the eye is to beslightly reduced. The drawing shows the point of the hook a
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
