machine, first, for its As the sources of error mentioned above are common to testing machines in general use, we think this will prove to own convenience and necessities; and, secondly, en account what at length, giving some account of its succeggful trial on the Providence road, and of… … between the lever, G, and the ping promptly but easily at sta- screws, E, which carry the cross- tions. Inthe economy of railway head, are so arranged that, by depressing the free end of G, operation, the engineer of the locomotive exercises a most im- the crosshead is pulled downwards, and by…
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