Abstract
This report is concerned with a new method of grain size analysis by sedimentation. The new method is also based on the assumption that all particles in a liquid descend with constant velocities dependent on their sizes. But the incorrect assumption, that the specific gravity at a level of a muddy liquid is measured by a hydrometer, is not introduced in the new method.
An equation is deduced which gives the integrated percentage as a function of the apparent increase of mass and its time derivative of a circular cylinder, partially immersed in the muddy liquid.
It is proved theoretically that the same equation is applicable for a totally immersed cylinder, under the condition that all particles initially exist in the part of the liquid over the cylinder remain permanently in that part.
