o which the instruments often have to be carried an electro-magnet. This causes the wheel to press from one room to another, and in which an en- against the paper and the time as shown by the deavor is made to avoid complicated installations. clock is recorded thereon. The wheel has a rat- the… … By this means fish-plates al- it is possible to ternately in- side and out obtain a more accurate result side the rail.
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