Window Hardware: Transom Operator
The Old House Web
Modeled after a 1920s original unit, this solid brass transom operator is designed to work on bottom-hinged windows up to 18? x 24?. Moving the thumb plate at the bottom of the 11/32" solid brass rod up or down opens and closes the window. The knurled brass knob locks the window in position. The assembly comes unlacquered and is reversible for use on the right or leftside of the window.
If you've just got to have an original, this company also deals in original transom operators. And if you have an odd-sized transom, the company will custom make a rod and link set.