WBL 1917
Historical Context
The WBL logo below was derived from an illustration in
the 1917 edition of The Electrician's Handbook . Each
character in the display contains of 21 light bulbs, and
is controlled by a system of metal rings with insulated interruptors.
The Handbook recommends that each character be
constructed at least two feet tall, to give the "talking sign"
maximum readability.
March 1995 - 3/30/95.21:15