Single Limb Manometer

AT left, equal pressure is imposed on The fluid in The well and in The indicating Tube. Reading is zero. AT the right, a positive pressure has been imposed on The liquid in The well causing The level To go down very sligthy.

Liquid level in indicating Tube has risen substantially. Reading is taken directly from scale at liquid level in indicating Tube. The scale has been compensated for the drop in level in the well.