Gauge, STEAM

Manometers to determine the pre ure of a vapor or gas inside a closed ve el. Simplest and for light pre ures is a mercury column in a U-tube, open or closed at the end not connected to the closed ve el. These are not adapted for higher pre ures. Here either a diaphragm or a Bourdon gauge will be used. A diaphragm gauge has a corrugated plate of elastic metal, and the vapor pre ure on one IMG:content-0234.jpg:[blocks in formation] made to determine the discharge and mean velocity of a stream. The usual method is to take soundings at two parallel cro sections from which their areas can be found, and to observe by means of floats the velocities at different parts of the stream. Gaul, GILBERT WILLIAM, b. 1855. American painter, whose subjects are largely from the Civil War.