Treatise on Iron Ship Building: Its History and Progress as Comprised in a Series of Experimental Researches on the Laws of Strain ... Including the Experimental Results on the Resisting Powers of Armour Plates and Shot at High Velocities

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Longmans, Green & Company, 1865 - Počet stran: 313

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Strana iii - Iron Ship Building, its History and Progress, as comprised in a Series of Experimental Researches on the Laws of Strain; the Strengths, Forms, and other conditions of the Material ; and an Inquiry into the Present and Prospective State of the Navy, including the Experimental Results on the Resisting Powers of Armour Plates and Shot at High Velocities.
Strana 40 - Exclusive of this difference, we must however deduct 30 per cent, for the loss of metal actually punched out for the reception of the rivets, and the absolute strength of the plates will then be, to that of the riveted joints, as the numbers 100, 68 and 46. In some cases, where the rivets are wider apart, the loss sustained is however not so great ; but in...
Strana 40 - ... obtained, as only two or three rivets came within the reach of experiment ; and, again, looking at the increase of strength which might be gained by having a greater number of rivets in combination, and the adhesion of the two surfaces in contact, which in the compressed rivets by machine is considerable, we may fairly assume the following relative strengths as the value of plates with their riveted joints...
Strana 141 - In the same year, two other 10-in. columbiads were cast, of the same iron, the one solid, and the other hollow. Both moulds were placed in the same pit, and all the space in the pit outside of the moulds was filled with moulding-sand, and rammed. This was done because the iron cases of the moulds were not large enough to admit the usual thickness of clay in the walls of the mould. It was apprehended that the heat of the great mass of iron within would penetrate through the thin mould, and heat the...
Strana 12 - Applying those results to two remarkably good examples of ships of 2,680 tons displacement, one of iron and the other of wood — described by Mr. John Vernon, in a paper read to the Institution of Mechanical Engineers, in 1863 — he finds the following values of the greatest stress of different kinds exerted on the material of the ship : — ' In the iron ship, tension 3-98 tons per square inch ; thrust 2-35 ; racking stress 0-975.
Strana 146 - The form, dimensions, weight, method of casting and cooling, and the manner of proving, were the same in all. It will be seen that the gun made of the strongest iron, with a short interval of time between its manufacture and proof, endured the smallest number of fires ; and that those made of weaker iron, but proved long after they were cast, endured the greatest number of fires. This remarkable feature in these trials suggests an inquiry as to the cause of such anomalous results.
Strana 80 - Here the strength to resist crushing follows the ratio of the square of the depth, as is found to be the case in the transverse fracture of rectangular bodies of constant breadth and span.
Strana 141 - ... ft., weighing about 700 tons, or 70 times the weight of the casting. The mean elevation of the temperature of all the water passed through the core in 94 hours, was about 3¿°. At the end of this period an attempt was...
Strana 141 - At the end of this period an attempt was made to withdraw the core from the casting, which proved unsuccessful. The contraction of the iron around it held it so firmly, that the upper part of it broke off, leaving the remainder imbedded in the casting. The stream of water was then diminished to about 2 feet per minute, which continued to circulate through the core for 48 hours.
Strana 196 - ... are, — 1. Very high statical resistance to rupture by compression. In this respect wrought iron and steel are both superior to cast iron ; in fact, the statical resistance of steel is more than three tunes and that of wrought iron more than two and a half times that of cast iron.

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