Synopses & Reviews
Synopsis
Excerpt from A Short Acount of an Improved Cannon: And of the Machinery and Processes Employed in Its Manufacture
Grain, or fibres, are less apparent, and the bars pos sess, in their different directions, greater equality of strength. By comparing the various operations of wire-drawing, rolling, and hammering, we are led to the conclusion that the fibres are always formed in the direction in which the iron is extended, and the cohesion is least amongst the atoms which are spread over each other. All that is here said of iron is equally true of steel, the cohesive force of which, however, exceeds in an essential degree that of iron. Cast iron and bronze, on the contrary, are, of equal strength in all directions; their structure appearing as an aggregation of grains, assuming the form of crystals, often apparent to the naked eye.
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