Assertion: seesaw | /r/HasAspect | oscillatable vseat
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Source sentences:
text: In combination with a seesaw having an oscillatable vseat--carrying horizontal vmember, ya vertical member pivotally mounted at the Vful- `crum of the seesaw .independently of the horizontal member, the vertical member extending Vbelow the fulcrum :of the seesaw and providing a footrest at the lowerfend thereof-on which the feetof the rider may be placed and the vertical member extending above the fulcrum of the seesaw providing holds adapted to be grasped by the rider whereby the vertical member may be oscillated by forces on the upper and lower portions of the Vertical member, and means connecting the vertical member and the horizontal member for causing the horizontal member to be oscillated when the vertical member is 0scillated.