GC, Gastric canal or foramen.
(After Lankester, toe cit.) Magnified MOO p GC. D R.
3 and 4, GC, DR).
GC =x/l and CH=-(1-x)11.
This expression shows that as a increases y increases until when Wa = gc, y becomes infinitely large.
The corresponding value of a, namely ~ gc/w, is called the critical velocity of the shaft, and is the speed at which the shaft ceases to rotate stably and at which centrifugal whirling begins.
According to the principles of statics, the resultant of the force P, applied at G perpendicular to the plane OG, and the couple M is a force equal and parallel to P, but applied at a distance GC from G, in the prolongation of the perpendicular OG, whose value is GC = M/P = R2/OG.