Abstract: To explain the continual contact plane transmission, it is wellknown that an equation of meshing is applied, I .C. the Euler-savary equation. By the application of this equation of meshing, when the two members’ motion and the radius of curvature of one member at the contacting point are given, we can find out the radius of curvature of the other member at the same point with regard to the general case of variable. Angular velocity in plane continual contact transmission for two member the problem cannot be easily solved with the aid of the Euler-Sa vary equation. In this paper the general case of variable angular velocity in plane continual contact trans-mission for two members is treated. In this case the equation of meshing is found to be The radius of curvature can be easily found by using this equation of meshing. It is pointed out that the Euler-Savary equation can be derived from this equation as a particular case.