I'm just guessing that he worked on the Fred Niblo _Ben Hur_ of the twenties, not the talkie of the fifties.
Oops, yes, you are correct of course, must have been the pre-Charlton (why does my computer keep correcting it as "charlatan"?), and undoubtedly far better version version of Ben Hur.

The Vade Mecum is a necessity, and can be bought from http://www.mwclassic.com/ or found occasionally on ebay.