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. 11. Sharpening the Plane-Iron. bly took off too much from the other end * till there wasnothing left. The skillful teacher proceeds with system and great should be no hap-hazard work and the class is to be kepttogether. He outlines the steps for squaring up a piece sub-stantially as follows: — 1. Select the cleanest (freest from knots, etc.) and most uni-form face and plane it smooth and true. Test the accuracy of 34 FIRST Y
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. 11. Sharpening the Plane-Iron. bly took off too much from the other end * till there wasnothing left. The skillful teacher proceeds with system and great should be no hap-hazard work and the class is to be kepttogether. He outlines the steps for squaring up a piece sub-stantially as follows: — 1. Select the cleanest (freest from knots, etc.) and most uni-form face and plane it smooth and true. Test the accuracy of 34 FIRST YEAR OF MANUAL TRAINING SCHOOL, [chap. IL the surface by the edge of the try-square. Mark this face thus :X, with Select the most suitable adjacent face and plane it square. Fig. 12. The Toe is pressed down with the Left Hand. with the first Use the smoothing plane, set fine, and apply thetry-square frequently. 3. With the marking gauge (and the pupils should be shown Chap. II.] AVOID ACCUMULATED ERRORS. 35 how to set and how to use this tool on a separate piece) lay offIf (or less, as the case may be) on each finished face from theiinished edge. 4. In succession, dress the two remaining faces down to thegauge lines, testing with the square as often as is necessary. Donot scratch a third gauge line for the last face, nor square fromNo. 3. The reason for the caution in the last remark is thatif face No. 4 is worked from No. 3, it is likely to have an* accumulated error. It should be taken for granted that no real work is exact, we cannot realize the ideal dimensions. What we call*accurate is only a close approximation. While we shouldmm at absolute accuracy, we must never assume that we havereached it; accordingly, as No. 3 is based upon No. 1 or No. 2
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmanualt, bookyear1906
