This is a variation of the very rare Edison "ironclad" fan. The earliest
style, seen HERE, had a disc
commutator enclosed behind a glass-covered back. That proved to be inefficient and
awkward, so the motor and castings were redesigned to use a conventional cylindrical
commutator exposed on the back of the fan.
Very small in size, the blades
measure only 7" in diameter. Unlike the earlier model, this version had bosses
added to the front of the casting to support a wire cage to protect the blades. Later
Edison ironclad fans had a more square-shaped cage with fancy wires. The Edison-Lalande
"Q" cells used for the earlier ironclad fan was replaced by the very tall
type S batteries, as were used with the larger Edison fans. The size and weight of
the original battery set is quite a contrast to the diminutive scale of the fan itself.
This
is the earliest of the open-back ironclad fans, still retaining a brass hook on the
top, allowing the base to be removed and the fan hung from a bracket. Shortly afterward
this feature was removed, though the (undrilled) raised boss is still seen on the
later motor castings.