| 摘要 |
<p>A swimming doll includes an electric motor unit for rotating the dolls arms through shafts 6. A transistor switch in the motor circuit is closed when the doll is immersed, water then bridging two terminals of a probe, Fig. 6 (not shown). The direction of motor rotation is controlled by a rotary current-reversing switch which itself responds to the orientation of the doll, the arms thus rotating in one direction for front crawl and the reverse direction of back crawl. <IMAGE></p> |
