CHAPTER I

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HOME-MADE WINDMILLS 1 The Paper Pinwheel--The Pinion-wheel Windmill--To mount the Pinion-wheel--The Four-blade Windmill--To mount the Windmill--The Eight-blade Windmill--The Hub--The Eight Blades--The Shaft--The Tail--To pivot the Windmill--To operate a Toy Jumping-jack.