Regulator wall clocks were the standard design for early Railway stations because of their larger, easy to read dials. Regulator wall clocks have stenciled word "Regulator" on its lower glass on many models. The term Regulator clock was used originally in 19th century railway stations where the conductors would change or "regulate" the time on the clocks from one railway station to the next, thus regulating the time so all of the clocks were close in sync with each other.
Regulator styles found themselves into schools in the 19th century where this octagonal face design became synonymous with the school houses where they resided. Many of the clocks of this design were then called "Schoolhouse Clocks" where they established their identity.
The Clock Depot offers a good selection of these regulator schoolhouse clocks with modern, dependable movements which may be seen at:
Schoolhouse Clocks