The right was pillaring Northam, but this statement raised no concern with the left.
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"The thing that bothers me the most is that we're staring at the greatest bull market in the last 20 years, where you can double your money in, like one of the world's best industrial companies, like a Boeing, which is sort of pillaring here for no good reason, up over 200 percent in two years and we're talking about this thing here that's lost 50 percent of its value in a month," Ross said.
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At times there was a three-day week, but the quarry soldiered on until 1941 when Sir Haydn's lease expired. He continued on a yearly lease until 1946 when a roof fall caused by the continued pillaring closed the quarry for good.
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Undulose extinction of fractured quartz affected by plastic deformation. The cavitation lamellae sometimes seem like small teeth or pillars, which is a well known effect from today's verified impact structures. The teeth become visible after acid etching. The effect is called pillaring.
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Wood pillaring of the beginning of the 20th century, in the old workshops of Mirat in Salamanca. The origins of the company began in 1812, the year in which Gregorio Mirat installed a starch factory in Salamanca (Spain). Afterwards, different lines of the business were developed. In 1841 his son Juan Casimiro was born, he would be very important in the development of Mirat.
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Periodic re-alignment of the station could be accomplished by adjustment of the beam attachments. At the inland stations, the nearly horizontally pointing troposcatter parabolic antennae had to be enclosed as part of the superstructure. Snow accumulation of about one meter per year caused subsidence which eventually necessitated a re-foundation. In 1977 and 1982, Danish Arctic Contractors carried out a delicate re-pillaring of the two ice cap stations through a “jacking-up” procedure that also laterally moved the station.
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The veins are separated by layers of harder rock, often granite or chert, which are called "hards". The slate vein worked at Parc was about thick, and sloped downwards at about 42 degrees. Unusually, the pillaring line, one of the planes in which rock can be split, was almost horizontal rather than vertical, and the foot joints did not run in a suitable direction to detach slate blocks from the floor of a chamber. Additionally, the rock above the vein was not hard enough to support the roof of large chambers.
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Because of this, Kellow's father, William, decided in 1880 to work the quarry from the bottom upwards, rather than adopting the more normal practice of working from the top downwards. In order to achieve this, an incline was driven downwards through the slate to the deepest level at which the quarry was likely to be worked. From that point, a tunnel was driven sideways, to give access to a series of chambers, which were worked by extracting rock from the roof of the chambers. The process was made easier by drilling along the pillaring line.
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The only control was a pressure valve, which was opened and closed to start and stop the pumping. As a result of the unusual direction of the pillaring plane, the quarry yielded slate which was very long but quite narrow, and Kellow decided that it was suitable for slate ridging. He improved manufacturing methods, doubling the output per man, and supplied plain ridging extensively to Britain and the Continent. Where such ridging was not sufficiently decorative, he produced a three-part interlocking design, where the two interlocking sides were held together by a central decorative crest, before being cemented onto the ridge of a roof.
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In 1909 the Bryn Eglwys slate quarry, the Abergynolwyn estate and village and Talyllyn Railway came up for sale. Aware of the distress which would be caused by permanent closure of the quarry Sir Haydn bought the lot himself in 1911 for £5250, and became the sole owner of what became the Abergynolwyn Slate and Slab Company. In 1935 he extended his quarry ownership, leasing the Aberllefenni Slate Quarry in the neighbouring Corris district. The quarrying and slate business did well until the early 1920s when demand fell and the Bryn Eglwys quarry was only kept open by pillaring the easy to obtain slate rather than by digging out new underground chambers.
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