Manual training--play problems; constructive work for boys and girls based on the play interest (1917)
Marten, William Samuel, 1877- · New York, The Macmillan company · leaf 116
er will serve as a catch. If used for plants, a pieceof cardboard should be slipped up against the glass sides to excludethe light, otherwise the light will drive the roots away from the glass. Fig. 2 shows a simpler construction of root-cage. No grooves areused, the edge of the glass fitting… … SIDE VIEW FIG. I EMD VIEW SCALE
Manual training · Toys · Games
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