ut 142 yards, whieh, a half inches long, and is at any age a clear white color, ex- it is said, ‘suffices to keep the line in self-acting working, cepting the head, which is dark red. They have no legs, after it has been started by means of the twelve horse power’ drill points. but are seemingly… … strength of 73 tons per square inch section is guar- + -—____—_- anteed. At the ends of the ropes weights of five Vibration of Bridges. tons and three tons are applied in the usual way At a recent meeting, in this city, of the American The distance between Society of Civil Engineers, a paper by…
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