Full Idea
Russell did not view logic as an uninterpreted calculus awaiting interpretations [the modern view]. Rather, logic is a single 'interpreted' body of a priori truths, of propositions rather than sentence forms - but maximally general and topic neutral.
Gist of Idea
Russell unusually saw logic as 'interpreted' (though very general, and neutral)
Source
report of B Russell/AN Whitehead (Principia Mathematica [1913]) by Bernard Linsky - Russell's Metaphysical Logic 1
Book Reference
Linsky,Bernard: 'Russell's Metaphysical Logic' [CSLI 1999], p.5
A Reaction
This is the view which Wittgenstein challenged, saying logic is just conventional. Linsky claims that Russell's logicism is much more plausible, once you understand his view of logic.