When he grew tall enough to peep through the keyhole of the great lock of the main door, he had divers times set down his father’s dinner, or supper, to get on as it might on the outer side thereof, while he stood taking cold in one eye by dint of peeping at her through that airy perspective.
This is a passage from Charles Dickens' Little Dorrit Chapter 18. What does the whole passage mean? What does "to get on as it might" mean?