Models and Multiplicities

I claim that Wittgenstein's reference to Hertz's "dynamical models" at 4.04 in the Tractatus provides evidence for the view that the Tractatus does not explain the sense of propositions by offering an account of the fundamental structure of reality. Just as Hertz's dynamical models capture what all mechanical descriptions of the same system have in common, so Tractarian analysis captures what all propositions that express the same sense have in common, and in neither case is there a need to appeal to an underlying ontology.