单词 | metrograph |
释义 | † metrographn. Obsolete. rare. An apparatus for indicating the speed of a train, and the hour of its arrival and departure at each station. ΚΠ 1858 P. L. Simmonds Dict. Trade Products 246/2 Metrograph, a controller of the speed of railway trains; this apparatus indicates at every moment and every mile the speed of the train, and the hour of arrival and departure at each station. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2022). < n.1858 |
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