Brady & Martin Ltd
Newcastle on Tyne
This instrument is used in steam turbine condensers which are operated at pressures below atmospheric pressure. (In a vacuum condition).
It measures pressures approaching a perfect vacuum. (0 pressure absolute).
The absolute pressure is indicated by a mercury column, usually expressed in inches of mercury.
This Instrument measures the very low Absolute pressure in the condenser.
The pressure would be about 1.5 inches of mercury
from the 0 at the bottom of the scale
Barometric pressure would be 30 inches of mercury