  We implement Feynman's suggestion that the only missing notion needed for the
puzzle of Quantum Measurement is the statistical mechanics of amplifying
apparatus. We define a thermodynamic limit of quantum amplifiers which is a
classically describable system in the sense of Bohr, and define macroscopic
pointer variables for the limit system. Then we derive the probabilities of
Quantum Measurement from the deterministic Schroedinger equation by the usual
techniques of Classical Statistical Mechanics.
