Page:American Journal of Sociology Volume 3.djvu/613

 CHARACTER BUILHIXG AT ELM IRA

599

Slats must be cut with the rip-saw larger than finished dimen- sions ; this introduces discrimination and decision in allowing tlu- additional dimensions for finish size. The muscles employed in ripping these strips are the muscles of the shoulder, alter- nately contracting and expanding, causing the entire arm to

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swing through a vertical plane hori/ontally. The motor ni strike upon the part of the brain which regulates concentration of purpose, with the result that the tool actuated by these forces produces strips t,> IK- later planed to five-eighths of an inch wide and ti\ nths o| an inch thick, cut off. and ends

planed to fifteen inches. Having produced four such strips, the two end pie< made, and upon these arc secured the strips.

These employ the saw. plane, rule, gauge, and knife. The mus< : are tin- full arm swing for planing and sa\\ IHL;. and

for cutting out the pieces between the legs; the muscles of the wrist conjointly with those of the fingers are used. This space is to be five-sixteenths >i an inch deep. Here comes the mental operation of locating ti\ e-i.xteenths ,i an inch on a rule, trans