United States or Bermuda ? Vote for the TOP Country of the Week !
Like all sea and river spirits, their subaqueous abode is of a magnificence unparalleled upon earth, and to this they often convey mortals, who, however, complain that the splendours of the nixies palaces are altogether spoiled for them by the circumstance that their banquets are served without salt.
The greatest proposed subaqueous tunnel is that intended to connect England with France under the English Channel a distance of twenty-one miles. Time and again the British Parliament has rejected proposals through fear that such a tunnel would afford a ready means of invasion from a foreign enemy. However, it is almost sure to be built.
Howard E. Coffin, vice-president of Hudson Motor Car Company and active in the development of internal-combustion engines. From the American Institute of Mining Engineers: William Laurence Saunders, chairman of the Board of Directors of the Ingersoll-Rand Company and inventor of many devices for subaqueous and rock drilling.
All the others would have watched this spectacle for a while, interested in the maternal and filial traits thus exhibited by a subaqueous creature, but while they stood looking into the water, something glanced before their eyes, and glided with a plunge to the bottom. It was the harpoon of Guapo.
Or it may be that the mine has penetrated into some hollow basin of impermeable strata filled only with porous material which is kept constantly saturated. To drain such a piece of country would mean practically the emptying of a lake. Subaqueous mining is therefore one of the big problems which the mining engineer of the twentieth century must tackle.
It is no doubt of volcanic origin, belched out of the bowels, and on to the surface, of the earth, by the sulphurous upheavings of subterraneous and subaqueous fires, and cooled and solidified into monstrous masses by the gelid currents of the deepmost waves of the most ancient of former oceans.
In a vastly remote past, and for a vastly extended period, the mighty deep rolled over the surface of a world inform and void, depositing a sediment of its used up living tenants, the microscopic cases of foraminiferae, sponges, sea-urchins, husks, and the cast limbs of crustaceans. The descending shells of the diatoms like a subaqueous snow gradually buried the larger dejections.
For a long time one hundred feet were regarded as a maximum depth and at that depth men were not permitted to work more than an hour in one shift. The ordinary subaqueous tunnel pressure is about forty-five pounds and this corresponds to a head of 104 feet. In working in the Hudson Tunnels the pressure was scarcely ever above thirty-three pounds, yet many suffered from the "bends."
Again, with the exception perhaps of some Pinnularioe, and Asterophyllites, there is a remarkable absence from the coal measures of any form of properly aquatic vegetation. The occurrence of marine, or brackish-water animals, in the roofs of coal- beds, or even in the coal itself, affords no evidence of subaqueous accumulation, since the same thing occurs in the case of modern submarine forests.
Somewhat similar appliances have been found very useful in the operations for laying the foundations of bridges. The details requiring to be worked out for the successful working of subaqueous systems of mining are numerous and important.
Word Of The Day