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Updated: May 18, 2025
Until lately the belief was widely held that our earth was one huge globe of liquid fire, with only a slender cooled crust covering her, a few miles in thickness. This view was supported by the fact that heat is found to increase as men descend into the earth. Measurements of such heat-increase have been taken, both in mines and in borings for wells.
Then he took off his covert-coat and his blazer, spread them neatly on the top step knelt on them turned up his shirt cuffs and went to work with brace-and-bit near the key-hole. But first he oiled the bit to minimize the noise, and this he did invariably before beginning a fresh hole, and often in the middle of one. It took thirty-two separate borings to cut around that lock.
The furnace is round, about three feet long and three feet in diameter, built of half a dozen fire-resisting substances in layers, perforated for electric wires, with an opening through it lengthwise of the exact size of the borings in the guns and in the cube.
The borings were taken to a depth of about seven inches, and after being thoroughly mixed together an average sample of the lot was placed in a small bag bearing a number which Percy recorded in his note book together with a description of the land. "I wish to have an analysis made of this sample," remarked Percy, as they resumed their walk.
So thin are they, that the aggregate amount accumulated in a century is said rarely to exceed five inches, although in the course of thousands of years it has attained a vast thickness, the bottom not having been reached by borings extending to a depth of 60 feet towards the central parts of the valley.
In Long Island City, where the tunnel lines were to pass diagonally under the passenger station building and passenger yard of the Long Island Railroad and under streets and private property, the arrangement of borings was less regular, although the alternation of wash-borings and core-borings was carried out as far as practicable.
Some moments later, we saw a dozen crewmen set foot on the shelf of ice, among them Ned Land, easily recognized by his tall figure. Captain Nemo was with them. Before digging into the ice, the captain had to obtain borings, to insure working in the best direction.
A. Rust joints are not now much used in engines of any kind, yet it is necessary that the engineer should be acquainted with the manner of their formation. One ounce of sal-ammoniac in powder is mingled with 18 ounces or a pound of borings of cast iron, and a sufficiency of water is added to wet the mixture thoroughly, which should be done some hours before it is wanted for use.
Percy collected soil from three different strata. The first sample represented the surface stratum from the top to six and two-third inches; the second sample represented the subsurface stratum from six and two-thirds to twenty inches; and the third sample represented the subsoil from twenty to forty inches, each sample being a composite of about twenty borings.
The Romans were benefactors to many portions of this dry land of Spain; they built up aqueducts which are still in use, but they neglected Cadiz. The town has been dependent on these springs of La Piedad for its water supply, except such as dropped from heaven, for three hundred years, and attempts to obtain water from wells or borings in the neighbourhood have invariably failed.
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