"The private residence of Mr Pancks was in Pentonville, where he
lodged on the second-floor of a professional gentleman in an
extremely small way, who had an inner-door within the street door,
poised on a spring and starting open with a click like a trap; and
who wrote up in the fan-light, RUGG, GENERAL AGENT, ACCOUNTANT,
DEBTS RECOVERED.

The fan-light is a distinctive feature of Georgian architectural style. I is a semicircular arch over a window,
with several sector shaped panes,which resemble an opened lady's fan. We have three such windows in our dining-room, but I didn't know the name for them until recently.