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A cat hole is a one-time-use pit toilet often utilized by campers, hikers and other outdoor recreationalists. Also referred to as the "cat method," it is formed by simply digging a hole in the ground just large enough to hold the feces from one defecation event. After use, the hole is refilled with the soil that was dug out.
A pot-in-pot refrigerator, clay pot cooler [1] or zeer (Arabic: زير) is an evaporative cooling refrigeration device which does not use electricity. It uses a porous outer clay pot (lined with wet sand) containing an inner pot (which can be glazed to prevent penetration by the liquid) within which the food is placed. The evaporation of the ...
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Throughout history, people have devised systems to make getting water into their communities and households and disposing of (and later also treating) wastewater more convenient. [1] The historical focus of sewage treatment was on the conveyance of raw sewage to a natural body of water, e.g. a river or ocean, where it would be diluted and ...
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Older structures may use asbestos, copper, iron, lead or clay pipes, in rough order of era of use. Under many older building codes, a vent stack (a pipe leading to the main roof vent) is required to be within approx. a 5-foot (1.5 m) radius of the draining fixture it serves (sink, toilet, shower stall, etc.). [ 2 ]
The Persian water clock consisted of a large pot full of water and a bowl with a small hole in the center. When the bowl became full of water, it would sink into the pot, and the manager would empty the bowl and again put it on the top of the water in the pot. He would record the number of times the bowl sank by putting small stones into a jar ...
Because of its shape, the trap retains some water after the fixture's use. This water creates an air seal that prevents sewer gas from passing from the drain pipes back into the building. Essentially all plumbing fixtures including sinks, bathtubs, and showers must be equipped with either an internal or external trap.