How the People's Charter envisaged a secret ballot taking place

In the absence of a great deal of practical precedent, how did the Chartists envisage a secret ballot working?

The question arose at last weekend’s Chartism Day conference when Dr Tom Scriven put on screen a copy of the People’s Charter, with its illustrations of a proposed ballot box, as part of his talk on Chartism’s electoral strategy.

And it turned out that none of us there appeared to know the answer.