The educational meaning of manual arts and industries . C •as ao bo * ? 1) DEVELOPMENT OF MOTOR CONTROL 91 As the practice continued this difference between theenergy in the right and left hand work,almost entirelydisappeared. It was nearly two months from the timeNo. 1 took the first series of exercises until he tookhis second series. At the beginning of the second serieshe felt that his left hand had lost nearly all its power tocontrol the saw. In three practice periods of the secondseries, that is, in half the original amount of practice, Plate Hi.. it regained all it had lost. Plate III sh
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The educational meaning of manual arts and industries . C •as ao bo * ? 1) DEVELOPMENT OF MOTOR CONTROL 91 As the practice continued this difference between theenergy in the right and left hand work, almost entirelydisappeared. It was nearly two months from the timeNo. 1 took the first series of exercises until he tookhis second series. At the beginning of the second serieshe felt that his left hand had lost nearly all its power tocontrol the saw. In three practice periods of the secondseries, that is, in half the original amount of practice, Plate Hi.. it regained all it had lost. Plate III shows how nearlythe left hands had attained to equal ease and controlwith the right on the fifth days practice in the secondseries. None of the boys in the brief practice given at-tained the same degree of relative skill and facility withthe left hand as compared with the right. One other characteristic of many of the curves isworthy of note. There was a very pronounced rise whenplacing the saw and beginning the cut, then a quiteregular but rapid fall. This was most marked in thecases of careful workers. 92 MANUAL ARTS AND INDUSTRIES One boy, No. 9, took a series of exercises in boringwith a brace and bit. A good brace with straight, firmbit adjustment, and a ^-inch bit were used. The materialwas a piece of 2 x4 inch clear pine, dressed on all sides.Lines one inch apart crossing one another at right angleswere ruled on both of the wide faces so that the pointsof intersection on one face came directly opposite thoseon the others. The aim was to st