"The weight of the locomotive was distributed over the driving-wheels in the usual locomotive practice by means of springs and equalizers.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin
They serve as equalizers of temperature and humidity, and it is highly probable that, in analogy with most other works and workings of nature, they, at certain or uncertain periods, restore the equilibrium which, whether as lifeless masses or as living organisms, they may have temporarily disturbed.
"The Earth as Modified by Human Action"
George P. Marsh
The Planetara's respiratory controls started; the pressure equalizers began operating, and the gravity plates shifted into lifting combinations.
"Astounding Stories of Super-Science April 1930"
Various