The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . eep thematerial sound. One great object of this exercise is to teachthe student the necessity of avoiding this operation whenstrength is to be preserved. It is much easier to do if theouter angle is left rounded; and, strange as it may appear, itwill be stronger thus, tho deficient in breadth, than when 92 THE SECOND, OR MIDDLE YEAR. [Chap, m. reduced to the exact shape of the drawing, — in consequence ofthe inevitable weakness of the inside c
The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals . eep thematerial sound. One great object of this exercise is to teachthe student the necessity of avoiding this operation whenstrength is to be preserved. It is much easier to do if theouter angle is left rounded; and, strange as it may appear, itwill be stronger thus, tho deficient in breadth, than when 92 THE SECOND, OR MIDDLE YEAR. [Chap, m. reduced to the exact shape of the drawing, — in consequence ofthe inevitable weakness of the inside corner. The exerciseshould be executed first in lead. ]Vo. 8. (Fig. 76.) Upset oval. Stock, h round, 5 long. The first step is to increase thesize of the piece in the centerby upsetting. Heat thecenter, cool the ends quickly,place the piece vertically onthe anvil, and strike heavy,square blows on the diameter at the centershould be increased to aboutI. The tapering ends re-quire great delicacy of ham-mering because one cannotuse the swages. Beforei:)unching the small hole, the student should practise at punch-ing a piece of plate or Fig. 75
Size: 1668px × 1498px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
