The Mechanic's Magazine, Museum, Register, Journal and Gazette, Band 38

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Robertson, 1843
 

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Seite 223 - After the revocation of the Edict of Nantes by Louis XIV., in 1685, the most cruel and protracted persecutions commenced against the Protestants of France.
Seite 238 - ... subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle, between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle ACS; and from the point A let AD be drawn (I.
Seite 474 - ... with strength. The artist was every day more certain that he should leave vultures and eagles behind him, and the contagion of his confidence seized upon the prince. In a year the wings were finished ; and, on a morning appointed, the maker appeared furnished for flight on a little promontory: he waved his pinions awhile to gather air, then leaped from his stand, and in an instant dropped into the lake.
Seite 62 - The gunpowder was in bags, placed in boxes. Loose powder was sprinkled over the bags, of which the mouths were opened, and the bursting charges were in the centre of the main charges. The distance of the charges from the face of the cliff, was from 60 to 70 feet.
Seite 62 - It was calculated that the powder, before it could find a vent, mu»t move 100,000 yards of chalk, or 200,000 tons. It was also confidently expected that it would move one million. " The following preparations were made to ignite this enormous quantity of powder : — At the back of the cliff a wooden shed was constructed, in which three electric batteries were erected. Each battery consisted of 18 Daniels' cylinders, and two common batteries of 20 plates each.
Seite 521 - With Plates. Two Volumes. Octavo. 32s. On Thunder Storms, and on the Means of Protecting Buildings and Shipping against the Effects of Lightning. By Sir W.
Seite 420 - Clay was founded on sound chemical principles. It was desirable to abandon the use of limestone as a flux : it was proved that the purest limestones contained phosphates, which, although advantageous in agricultural processes, were detrimental in iron making. Mr. Fox had tried some specimens of Mr. Clay's iron, and found them to bear severe tests, as well as the best cable bolt iron made in the ordinary manner. Mr. Clay explained that Mr. Heath's process was not indispensable, for converting into...
Seite 38 - ... of the exterior coat prevents a satisfactory judgment as to the tint or complexion of the ivory within. After the most careful scrutiny on the outside of the tooth, however, the first cut is always one of a little anxious expectation, as the prognostics are far from certain, and before proceeding to describe the preparation of ivory, I will say a few words of its internal appearance when exposed by the saw. The African ivory, when in the most perfect condition, should appear when recently cut...
Seite 521 - Chancerylane, civil engineer, for certain improvements in obtaining copper from copper ores, some part or parts of which improvements are applicable to obtaining certain other metals contained in some copper ores, — being a communication.
Seite 420 - Elba ore, and which would (he had little doubt) produce as good iron as that from the Dannemora ore. Dr. Faraday remarked, that the process invented by Mr. Clay was founded on sound chemical principles. It was desirable to abandon the use of limestone as a flux : it was proved that the purest limestones contained phosphates, which, although advantageous in agricultural processes, were detrimental in iron making.

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