Assertion: seesaw | /r/CapableOf | comprise horizontal base portion
Facets:
Source sentences:
text: A seesaw comprising a support including a horizontal base portion, an elongated seat-carrying member, suspension means between said support and said member intermediate the ends of the latter, means connecting said support and one end of said member for permitting lateral movement of said end and twisting of said member about its longitudinal axis, one of said means providing with said support a resilient counterbalance for a rider carried by said seat-carrying member.