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(ii) Gauge Scale
It measures small difference of pressure. It is modified form of Simple Manometer whose one limb is made of larger cross section area.
(d) Inclined Manometer
It measures small pressure low velocity gas flow
S = specific gravity of liquid
gw = specific weight of water
g = specific weight of manometric liquid
(iii) Mechanical Gauges : These are used for rough measurement of high pressure. These are based on spring balance mechanism. Ex. Bourdon tube pressure gauge.
(iv) Aneroid Barometer or Mercury Barometer : It is used to measure local atmospheric pressure on absolute scale.