Siphon gauge

a glass siphon tube, partly filled with mercury, - used to indicate pressure, as of steam, or the degree of rarefaction produced in the receiver of an air pump or other vacuum; a manometer.
See under Gauge.

See also: Gauge, Siphon

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
This machine combined a pressure plate anemometer to register wind speed, a vane to register wind direction, and a siphon gauge to register rainfall.