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A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [2] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [3]
An intercom and/or video camera are often used to allow the guard to control the trap from a remote location. In an automatic mantrap, identification may be required for each door, sometimes even different measures for each door. For example, a key may open the first door, but a personal identification number entered on a number pad opens the ...
A trap primer (or trap seal primer) is a plumbing device or valve that adds water to traps.The water seals in traps are needed to prevent sewer gases from entering buildings, but because this water is exposed to the air, it is subject to evaporation over time in infrequently used floor drains, leading to the release of sewer gas into the environment.
Actuator, driver or unclassified final control element For reference designation of any equipment in industrial systems the standard IEC 61346 ( Industrial systems, installations and equipment and industrial products — Structuring principles and reference designations ) can be applied.
The Trap Door – Volume 2 – The Stupid Thing (102137) 14 June 1999 Scunge, Oh Globbits, Moany Boni, The Horrible Thing, Not Very Nice, Bugs, Yum Yum, Birthday Surprise, The Stupid Thing, Boo!, The Lump, The Splund, Nasty Beasty, What a Weirdo and The Big Red Thing The Trap Door – Volume 3 – The Pain (102097) 11 October 1999
A linear actuator is an actuator that creates linear motion (i.e., in a straight line), in contrast to the circular motion of a conventional electric motor. Linear actuators are used in machine tools and industrial machinery, in computer peripherals such as disk drives and printers, in valves and dampers , and in many other places where linear ...
Basement floor drains that connect to sanitary sewers need to be filled regularly to prevent the trap from drying out and sewer gas from escaping into the basement. The drain trap can be topped up automatically by the condensation from air conditioners or high-efficiency furnaces. A small tube from another downpipe is sometimes used to keep the ...
The Springfield model 1865 fired a rimfire .58-60-500 cartridge (.58 inch 500-grain (32 g) bullet, 60 grains (3.9 g) of black powder), the caliber matching that of the Civil War Minié ball, which was originally used in these rifles. The Model 1865 quickly became obsolete, and most of them were sold in the 1870s to several American arms dealers.