There is a pressure-gauge on the pipe leaving the compressor and another on the one entering it.
We connect a pressure-gauge to it, and see what the finger of the gauge has to say.
A pressure-gauge to register the depth of the sinker has been added by Sir William.
It is connected with the pressure-gauge n, and is further provided with a control thermometer o.
Hurriedly he opened the draughts in the fire-box, shook up the coals, and saw the needle begin to quiver on the pressure-gauge.