Worst, Edward F. (Edward Francis), 1866-1949, Barber, Harriette, [from old catalog] joint author, Seymour, Marian, [from old catalog] joint author · Chicago, A. W. Mumford and company · leaf 253
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 tested. … FIGURE X.250 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…
Manual training · Paper work · Basket making
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