9. shot (n.) a consecutive series of pictures that constitutes a unit of action in a film
The vacuum level is determined by the pressure differential between the evacuated volume and the surrounding atmosphere. Several units of measure can be used. Most refer to the height of a column of mercury â usually inches of mercury (in.-Hg) or millimeters of mercury (mm-Hg).
If the pressure vacuum breaker assembly does not have built-in unions between the shutoff valves and interior body: Measure the length of the union body not including connection hubs. Measure down from the third mark and place a fourth mark. Cut on the fourth mark to achieve minimum installation height.