The London journal of arts and sciences (and repertory of patent inventions) [afterw.] Newton's London journal of arts and sciences

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William Newton
1842

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Seite 170 - Thomas Richardson, of Newcastle, chemist, for a preparation of sulphate of lead applicable to some of the purposes for which carbonate of lead Is now applied.
Seite 194 - ... sensitive calotype paper. I prefer to conduct the process in the open air, under a serene sky ; but without sunshine, the image is generally obtained in half a minute or a minute. If sunshine is employed, a sheet of blue glass should be used as a screen to defend the eyes from too much glare, because this glass does not materially weaken the power of the chemical rays to affect the paper. The portrait thus obtained on the calotype paper is a negative one, and from this a positive copy may be...
Seite 67 - Huthven, of Rotherham, engineer, for a new mode of increasing the power of certain media, when acted upon by rotary fans or other similar apparatus.
Seite 389 - John Carr, of North Shields, earthenware manufacturer, and Aaron Ryles, of the same place, agent, for an improved mode of operating in certain processes for ornamenting glass. — Sealed 9th November — 6 months for inrolment.
Seite 191 - ... brush, taking care to wash it on the side which has been previously marked. This operation should be performed by candlelight. Let the paper rest half a minute, and then dip it into water. Then dry it lightly with blotting-paper, and finally dry it cautiously at a fire, holding it at a considerable distance therefrom. When dry, the paper is fit for use.
Seite 286 - ... immense pressure of four hundred atmospheres, without bursting ; but if the end of an iron rod was slightly pressed against the extremity of the tube, and the rod caused to vibrate longitudinally by rubbing it with a leather glove covered with resin, the tube was invariably shattered to pieces. Hence he concludes, that something more than the simple excess of pressure of steam in the boiler is necessary to cause an explosion, and that a slight vibratory motion alone, communicated suddenly, or...
Seite 367 - In the author's report on the state of the bridge, he noticed what he deemed defects in the construction of the roadway, but as there was no positive symptom of failure, it was allowed to remain. He conceived, that in the anxiety to obtain a light roadway, mathematicians and even practical engineers, had overlooked the fact, that when lightness induced flexibility, and consequently motion, the force of momentum was brought into action, and its amount defied calculation. On the llth of October, 1838,...
Seite 202 - Dantzic deal (Kyanized): the lengths vary from 46 feet to 20 feet, by 11 inches wide and 3 inches thick : they are so disposed, as that the first course of the rib is two whole deals in width, the next is one whole and two half deals, crossing the joints longitudinally as well as in the depth. Each rib consists of fourteen deals in thickness, bent over a centre to the required form, and secured together by oak treenails l\ inch diameter at intervals of 4 feet apart, each treenail traversing three...
Seite 342 - Having thus described the nature of my invention, and the manner of carrying the same into effect, I would have it understood that I do not...
Seite 456 - French centreings. As the arch rose from the springing, the crown of the centreing was loaded with stones, to prevent it rising and altering the shape of the arch. The cost of the entire aqueduct, which was about 21 miles long, with all the immediate and collateral works, and including the reservoir, was two millions and a half sterling. The communication was accompanied by three elaborate drawings of the general construction and details of the aqueduct, with the manner of carrying the stones. May...

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