Worldâs first parking meter installed. Share this: The worldâs first parking meter, known as Park-O-Meter No. 1, is installed on the southeast corner of what was then First Street and Robinson Avenue in Oklahoma City, Oklahoma on this day in 1935. The parking meter was the brainchild of a man named Carl C. Magee, who moved to Oklahoma City from New Mexico in 1927.
Check rate of air pressure buildup: When the engine is at operating RPM, the pressure should build from 85 to 100 psi within 45 seconds in dual air systems. (If the vehicle has larger than minimum air tanks, the buildup time can be longer and still be safe.
The EBT21 is ideal for low air flow measurement, and units of measurement are given in cubic feet per minute (cfm). Cfm describes the rate at which a volume of air moves in a certain period of time. This model has a measurement range of 25â 2500 cfm. A balometer identifies opportunities to improve air flow distribution within a duct system.