Constructive work; . FIGURE VIII. When studying the different kinds of trees, a test as to thestrength of the different kinds of woods makes a very inter-esting lesson. Figure VIII. shows a way by whichthe different woods may be FIGURE While the three classes of levers may be illustrated bymeans of a ruler and triangular prism for a fulcrum it isalso well to encourage older boys to construct a piece ofapparatus by which they may illustrate. In the above fig-ures the power arm may be moved to and fro by removingthe peg.

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Keywords: ., bookcentury1900, bookdecade1900, booki, booksubjectmanualtraining