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In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.
Many early closed cars, such as the 1933 Pontiac Economy Eight had front and rear vent windows called "ventiplanes" and were installed on all GM products that year. It has hinges and a latch, so it can be opened for additional ventilation. 1933 was the first year all GM vehicles were installed with optional vent windows which were initially called "No Draft Individually Controlled Ventilation ...
A Rolling Weight Deflectometer (RWD) is a deflectometer that can gather data at a much higher speed (as high as 55 mph) than the FWD, which allows the data to be collected without traffic control and lane closure. [8] It is a implemented as a tractor-trailer with laser measuring devices mounted on a beam under the trailer.
An object hitting a surface is an example of deflection. Deflection is a change in a moving object's velocity, hence its trajectory, as a consequence of contact with a surface or the influence of a non-contact force field.