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See Fulcrum.

Propped; supported by accessory organs. [R.] Gray.

orms. They have rhombic, ganoid scales, a heterocercal tail, paired fins without an axis, fulcra on the fins, and a bony skeleton, with the vertebræ convex in front and concave behind, forming a ball and socket joint. See Ganoidel.

he one drawn by Hogarth). -- Line of centers. (Mach.) (a) A line joining two centers, or fulcra, as of wheels or levers. (b) A line which determines a dead center. See Dead center, under Dead. -- Line of dip (Geol.), a line in the plane of a stratum, or part of a stratum, perpendicular to its intersection with a hori…

r needle, upon which the forces act. -- Torsion scale, a scale for weighing in which the fulcra of the levers or beams are strained wires or strips acting by torsion.