| http://www.w3.org/ns/prov#value | - FIG. 2 is an enlarged, fragmentary, sectional plan view, taken on the line 2--2 of FIG. 1, of a reference pressure tube within the tank which is isolated at the beginning of the test period to reflect a head pressure which is used as a reference pressure, the section being taken in the plane of the vertical axis of the cylindrical tank;
|
