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The megalithic yard is a hypothetical ancient unit of length equal to about 2.72 feet (0.83 m). [ 1 ] [ 2 ] [ 3 ] Some researchers believe it was used in the construction of megalithic structures. The proposal was made by Alexander Thom as a result of his surveys of 600 megalithic sites in England , Scotland , Wales and Brittany . [ 4 ]
Some Swedish so-called megalithic stone cists also have port-holes. In German, such a hole is known as a Seelenloch ("soul hole"), a name that originated because of the erroneous assumption that holes were created with the intention of releasing the soul of the deceased (in the minds of the builders).
The test may be stopped if any of the following conditions are met: (1) a total of 50 blows have been applied in any one of the 15 cm (6 in) intervals, (2) a total of 100 blows have been applied over the total 45 cm (18 in) depth, or (3) there is no observed advance of the sampling tube during 10 successive blows.
They achieve this by flinging the loose sand out of the pit and permitting the sand to settle at its critical angle of repose as it falls back. Thus, when a small insect, commonly an ant, blunders into the pit, its weight causes the sand to collapse below it, drawing the victim toward the center where the predator that dug the pit lies in wait ...
Fill dirt is taken from a location where soil is being removed as a part of leveling an area for construction; it may also contain sand, rocks, and stones, as well as earth. Fill dirt should be as free of organic matter as possible since organic matter will decompose creating pockets of empty space within the fill which could result in settling ...
If the holes are on 2 inch center, 36 holes will be punched per square foot. After a field is aerified, the cores can either be raked up and removed, or left on the surface to break down. Once a field is aerified, and there are holes in the surface, a field should be topdressed with the same sand that was used in the construction of the field.
The collapse of a sand hole that killed a 5-year-old Indiana girl who was digging with her brother on a Florida beach is an underrecognized danger that kills and injures several children a year ...
Boring is drilling a hole, tunnel, or well in the Earth. It is used for various applications in geology, agriculture, hydrology, civil engineering, and mineral exploration. Today, most Earth drilling serves one of the following purposes: return samples of the soil and/or rock through which the drill passes; access rocks from which material can ...