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 40
STOCK I DISC_dDIAIvlXK6 FIG.2. / CO * o O SIDE VIEW V r*— -4-- , * t EOGE VIEW STOCK l DISC 3/4 X /a A 4 SCALE STOCK FOR DRILLI STRIRJH * %- * 0 I DISC 3DIAM /n^. I ftOD HDiAn X 7 … SIDE. VIEW JXL wind and spin in the opposite direction. As soon as it is unwound,relieve the pressure on the horizontal piece and the momentum of thedisc will cause it to wind itself up again. By thus repeatedly press-ing and relieving the pressure, the drill is kept continuously in motion. 12…
Manual training · Toys · Games
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