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A sprinkler system timer is an electrical device that is used to set an irrigation sprinkler system to come on automatically at a certain time. Irrigation timers first appeared in the early 1960s to control large-radius lawn sprinklers, which at the time usually contained their own electrically operated valve (most golf-course sprinklers still use this type of actuation).
An impact sprinkler head in action Sprinklers spraying water to irrigate vine plants in a vineyard. An irrigation sprinkler (also known as a water sprinkler or simply a sprinkler) is a device used to irrigate (water) agricultural crops, lawns, landscapes, golf courses, and other areas. They are also used for cooling and for the control of ...
An impact sprinkler (sometimes called an impulse sprinkler) is a type of irrigation sprinkler in which the sprinkler head, driven in a circular motion by the force of the outgoing water, pivots on a bearing on top of its threaded attachment nut. Invented in 1933 by Orton Englehart, it quickly found widespread use.
Increased fire response time: Because the piping is empty at the time the sprinkler operates, there is an inherent time delay in delivering water to the sprinklers which have operated while the water travels from the riser to the sprinkler, partially filling the piping in the process.
The hydraulic calculation procedure is defined in the applicable reference model codes such as that published by the US-based National Fire Protection Association (NFPA), [2] or the EN 12845 standard, Fixed firefighting system – Automatic sprinkler systems – Design, installation and maintenance.
S-70 Okhotnik-B. The Sukhoi S-70 Okhotnik-B (Russian: Сухой С-70 "Охотник", lit. 'Hunter'), also referred to as Hunter-B, [2] [3] is a Russian heavy unmanned combat aerial vehicle (UCAV) that was being developed during the 2010s by Sukhoi and Russian Aircraft Corporation MiG. [4]
The prosecution of Hunter Biden on federal firearms charges stems from a 7-page form that would-be gun buyers must fill out when purchasing a weapon from a licensed gun business. The form includes ...
ATF Form 4473, October 2016 revision. A Firearms Transaction Record, or ATF Form 4473, is a seven-page form prescribed by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) required in the United States of America to be completed when a person proposes to purchase a firearm from a Federal Firearms License (FFL) holder, such as a gun dealer.