The electric water level indicator
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The problem of automatically indicating, at a distance, the height of water in a storage basin or open water way is one which chiefly concerns water power plants although it may come up, of course, in many different cases. However, for the intelligent and secure operation of a hydro-electric plant, the necessity of the station attendant or operator having a constant knowledge of the conditions of the water supply, and especially any sudden changes, is imperative. For plants operating with small storage and high head, or with long flumes, it is especially necessary to have a close and accurate knowledge of the conditions. Again, where there is one plant with a limited constant supply of water and no storage, which operates in parallel with a plant which has storage, it is extremely desirable to know the conditions so that the former can run just below the point of overflow, and thus conserve the storage to the best advantage. Hence, it follows that there are but few hydro-electric concerns operating with open waterways which do not spend, sooner or later, something on the installation of an indicator.
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