Reynolds, Osborne, 1842-1912, Brightmore, Arthur William, 1864-, Moorby, William Henry, 1872- · Cambridge [Eng.] The University Press · leaf 334
press the direction of the plane as wellas the aggregate value carried across it. CxiQ), with the superimposed symbol, expresses the group over which thesummation extends; u + indicates that the summation is taken over allthose molecules which are moving in the positive direction as regards theaxis… … Iig. 9- 67. As indicated by the signs of the component velocities, the moleculesin a unit of volume, or the molecules which cross a surface at a point in aunit of time, will be divided into eight groups. These groups may be indicated by the eight corners of a cube, having its •314 ON CERTAIN…
