The observed variation of mass of any elementary particle with its velocity, and the Lorentz transformation, are derived on a neo-Ritzian, i.e., Newtonian, basis. Measurement is defined by the ratio q = Q/q(bar); q is the quantity (distance, mass or time) as a numerical or symbolic value, Q is the physical quantity measured, and q(bar) is the comoving material physical unit adopted for the measurement. Four postulates are adopted, (1) velocity-dependent interactions can be formulated as laws only in the rest frame of ambient matter, (2) any dynamical equation valid in the laboratory rest frame is valid also in any frame unaccelerated therein, (3) each pointlike noncomposite component, or differential of string length, of any elementary particle has speed C = 3 X 1010 cm/s in ambient matter, and (4) Newtonian mechanics represents the quantum substrate. A neo-Ritzian model of the quantum substrate is defined with which the four postulates are compatible, postulate 3 being grounded on it. An experiment is proposed to test the physical reality of the model.
The Mach momentum qA of a particle, the product of its conjectured Mach charge q and the ambient Mach vector potential A, is the homolog of its electromagnetic inductive momentum. If the particle's velocity is , its ?inertial mass? is the ratio m = qA/v. It is conjectured that the field of the Mach charge is propagated at hyperluminal velocity, causing physical relations underlying quantum laws presently understood as ?acausality,? ?nonlocal action,? or ?action-at-a-distance.?