One wonders whether J S Chartres might be
John Smith Chartres (1862-1927)
There seems to be an odd gap in his biography between 1885 and 1902. Perhaps he did some translation work.
Whether he is or not, I can't see any translator working before 1886 still being alive in 1947.
I suppose Alex has the final say, but I don't think there'd be any objection to having this work in the MobileRead library.