The Quarterly Journal, Band 19John Murray, 1825 |
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Seite 70 - ... been raised; let the middle now be again raised a little, and this will be a good general representation of most, if not all large tracts of mountainous countries, together with the parts adjacent, throughout the whole world. From this formation of the earth, it will follow that we ought to meet with the same kinds of earths, stones, and minerals, appearing at the surface, in long narrow slips, and lying parallel to the greatest rise of any long ridges of mountains; and so in fact we find them.
Seite 166 - This mark of John was eighteen inches within the tree, and something more than a foot from the centre : it was cut down in 1791 , but the middle year of John's reign was 1207, from which, if we subtract 120, the number of years requisite for a tree of two feet in diameter to arrive at that growth, it will make the date of its planting 1085, or about twenty years after the Conquest.
Seite 338 - Magnets more and less powerful were used, some so strong as to bend the wire in its endeavours to pass round it. Hence it appears, that however powerful the action of an electric current may be upon a magnet, the latter has no tendency, by reaction, to diminish or increase the intensity of the former ; — a fact which, though of a negative kind, appears to me to be of some importance.
Seite 69 - I think it is more to be admired, that he has laid down an hypothesis, whereby he has explained so many wonderful and before inexplicable things in the great changes of this globe, than that some of them should not easily go down with some men; when the whole was entirely new to all. He is one of those sort of writers, that I always fancy should be most esteemed and encouraged: I am always for the builders, who bring some addition to our knowledge, or at least some new things to our thoughts.
Seite 138 - ... the fire-door, so as to meet and reverberate the smoke on to the ignited fuel in the grate, which causes it to inflame and become a sheet of bright fire under the bottom of the boiler.
Seite 69 - Let a number of leaves of paper, of several different sorts or colours, be pasted upon one another; then bending them up together into a ridge in the middle, conceive them to be reduced again to a level surface, by a plane so passing through them, as to cut off all the part that had been raised; let the middle now be...
Seite 146 - Too great precautions cannot be taken to give the lightning a ready passage into the ground, for it is chiefly on this that the efficacy of a paratonnerre depends. As iron bars are difficult to bend according to the projections of a building, it has been proposed to substitute metallic ropes in their stead. Fifteen iron wires are twisted together to form one strand, and four of these form a rope, about an inch in diameter. To prevent its rusting, each strand is well tarred separately, and after they...
Seite 266 - From these he deduced the following general law; viz. that the deviation due to rotation in a dipping needle " will always be such, that the sides of the equator of such dipping needle will deviate in a direction contrary to the directions in which the edge of the plate moves, that edge of the plate nearest to either edge of the equator producing the greatest effect.
Seite 166 - ... the Conquest. The tree, therefore, when cut down in 1791, must have been 706 years old, a fact scarcely credible ; for it appears from the trees whose marks are better authenticated, that those exactly of the same size, when marked, had increased twelve inches in diameter in 173 years, whilst this tree had increased no more than eighteen inches in 584 years.
Seite 144 - ... a portion is cut off from the upper end, about 20 inches in length, and replaced by a conical stem of brass or copper, gilt at its extremity^ or terminated by a small platina needle, two inches long.* The platina needle should be soldered with silver solder to the copper stem ; and to prevent its separating from it, which might sometimes happen, notwithstanding the solder, it is secured by a small collar of copper. The copper stem is united to the iron one by means of a gudgeon which screws into...