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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]
[2] Roof edge protection can take the form of personal fall arrest systems (PFAS), fall restraint systems, guardrail systems, warning line systems, safety monitors, or ladders. Since construction is one of the most dangerous professions in the world, roof edge protection offers much-needed protection against falls from heights which is one of ...
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.
An actuator is a component of a machine that produces force, torque, or displacement, when an electrical, pneumatic or hydraulic input is supplied to it in a system (called an actuating system). The effect is usually produced in a controlled way. [1] An actuator translates such an input signal into the required form of mechanical energy.
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 ...
Springfield Model 1866, trapdoor breech closed. In 1872–1873 a military board, headed by Brigadier-General Alfred H. Terry, conducted an examination and trial of 99 rifles from several domestic and foreign manufacturers, including those from Springfield, Sharps, Peabody, Whitney, Spencer, Remington, and Winchester pursuant to the selection of a breech-loading system for rifles and carbines ...
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
Berk goes fishing with a reluctant Boni, leaving the trap door open. He is followed by Rogg, a friendly ape who emerges from the Trap Door. 5 "Gourmet's Delight" 10 October 1986: Berk makes a gourmet dinner, leaving the kitchen in a mess. An invisible thing called the Bubo emerges from the Trap Door and causes mischief, until made visible by ...