A Journal of Natural Philosophy, Chemistry and the Arts, Volumes 3-4

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Page iii - An Account of a Method of Copying Paintings upon Glass, and of making Profiles by the Agency of Light upon Nitrate of Silver; with Observations by H.
Page 251 - They iffue out of him at every pore, and that animated robe covers him fo entirely, that nothing can be perceived but the top of his head. He then turns to a dirty white, the little worms appear black to the eye, but their true colour is a deep brown. This operation...
Page 165 - It was, however, easy to find two portions of light sufficient for the production of these fringes ; for, the light transmitted through the water, moving in it with a velocity different from that of the light passing through the interstices filled only with air, the two portions would interfere with each other, and produce effects of colour according to the general law.
Page 240 - Thus he tells us, vol. 1st, p. 185, that in all continents the general declivity, taking it from the summit of mountains, is always more rapid on the western than on the eastern side ; thus...
Page 70 - Took an ale glass of a conical figure, 2| inches in diameter and 3 inches deep ; filled it with water that had been standing in the room, and consequently of the temperature of the air nearly — Put the bulb of a thermometer...
Page 24 - ... 5, which is only suitable for very high velocities. SIR JOHN LESLIE states,* that the mean velocity of a river in miles per hour, is -fj~t,hs of the mean proportional between the hydraulic mean depth and the fall in two miles in feet. This rule is equivalent, for measures in feet, to (107.) v = 100 *J~r7; and is applicable to rivers with velocities of about 2^ feet per second.
Page 67 - ... water poured upon it of different temperatures suffering it to stand, without agitation. He found that about 6lb. of boiling hot water melted little more ice than as much water of 41°; and that by making such allowances as the experiments seemed to warrant for deductions when hot water was used, water of 41°, or 9° above the freezing point, melted quite as much, and often more, than the hot water: from which he infers, that water, and by analogy all other fluids, do not transmit heat in the...
Page 163 - ... that this difference must consequently be smaller as the fibre became smaller; and, the number of fringes in a right angle becoming smaller, that their angular distances would consequently become greater, and the whole appearance would be dilated. It was easy to calculate that for the light least inflected the difference of the paths would be to the diameter of the fibre very nearly as the deviation of the ray at any point from the rectilinear direction to its distance from the fibre. I therefore...
Page 251 - As foon as the worms are hatched, and without quitting the fpot where the egg is which they have broke through, they yield a liquid gum, which by coming into contact with the air, becomes folid and flimy.
Page 82 - ... of the two media. When, therefore, the refractive power of one medium is known, that of any rarer medium may be learned, by examining at what angle a ray of light will be reflected from it. For...

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