Lectures Delivered at the Bristol Mining School, 1857Mining School, 1859 - 293 páginas |
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Lectures Delivered at the Bristol Mining School, 1857 Bristol Mining School Visualização completa - 1859 |
Termos e frases comuns
accidents angle atmospheric basin beds boiler bordgates bottom bricks Bristol Mining School calcareous carbonic acid carboniferous limestone carriages chalk character clay coal field coal measures coal shales colliery condition contain Cornwall cretaceous crib cubic feet cylinder deposits Devonian diameter district division employed England eocene excavations explosion feet in thickness fire fire-damp formation fossils fresh water furnace galleries gases geological green-sand grit heat horizontal hydrogen important inches iron Isle Isle of Wight labour lamp lecture lias London clay lower marine marls middle millstone grit mineral old red sandstone oolite organic remains paleozoic pass period portion pressure produced Purbeck quantity railway remarkable rocks roof sands seams of coal shales shells side siliceous silurian slate South Wales species steam engine stone strata sufficient surface temperature tertiary timber tons underground upcast shaft upper veins ventilation Wealden weight yards
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Página 226 - One vessel of water rarefied by fire driveth up forty of cold water ; and a man that tends the work is but to turn two cocks, that, one vessel of water being consumed, another begins to force and refill with cold water, and so successively, the fire being tended and kept constant, which the selfsame person may likewise abundantly perform in the interim, between the necessity of turning the said cocks.
Página 166 - Honour and shame from no condition rise ; Act well your part, there all the honour lies.
Página 226 - ... a way to make my vessels so that they are strengthened by the force within them, and the one to fill after the other, I have seen the water run like a constant fountain-stream forty feet high ; one vessel of water rarefied by fire driveth up forty of cold water.
Página 225 - An admirable and most forcible way to drive up water by fire, not by drawing or sucking it upwards, for that must be as the philosopher calleth it, infra spheeram activitatis, which is but at such a distance. But this way hath no bounder, if the vessels be strong enough ; for I have taken a piece of a whole cannon, whereof the end was burst, and filled it...
Página 226 - ... though it work day and night from one end of the year to the other, it will not require forty shillings...
Página 158 - geology, in the magnitude and sublimity of the objects of which it treats, undoubtedly ranks, in the scale of the sciences, next to astronomy...
Página 195 - ... a land of brooks of water, of fountains and depths that spring out of valleys and hills; a land of wheat, and barley, and vines, and...
Página 88 - ... contrary to its motion before it became stationary. Let the compasssight be now fastened to the horizontal plank. During this observation it will be necessary to have the plumbline lighted; this may be done by an assistant holding a candle near it. Let now a staff, with a candle or lamp upon it, be placed at a distance of thirty or forty yards from the plumb-line, and in the same direction with it and the compass-sight. The...
Página 89 - VENTILATION. 137 temperature of 100", were heavier than a column of air of 21 1 yards in height and 82° in temperature. It has been already shown that the amount of ventilation effected by a furnace is as the square root of the difference between the temperatures of the downcast and upcast shafts, and also as the square root of depth of the furnace from the surface. It is for this reason that fire-lamps hung a short distanee down the upcast shaft are inefficient, and only admissible as a temporary...
Página 225 - ... of water, stopping and screwing up the broken end, as also the touch-hole, and, making a constant fire under it, within twenty-four hours it burst, and made a great crack...