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).
PRESSURE VACUUM BREAKER. INSTALLATION. 1. The Pressure Vacuum Breaker Assembly must be installed. where it is accessible for periodic testing or repair. 2. The device must not be installed in a pipe line until the. line has been flushed of foreign material. Failure to flush. the lines completely may cause the check members to.