Tests of the comparative efficiencies of hydraulic and electric cranes tend to show that, although they do not vary to any very considerable extent with full load, yet the efficiency of the hydraulic crane falls away very much more rapidly than that of the electric crane when working on smaller loads.
Differences not only in the size of towns, but in the arrangement and char - acter of the population, make each district a telephone problem b3, itself, and nullify close comparisons between telephone rates and telephone efficiencies in different areas and different countries.
- The combined engine and boiler efficiency has hitherto been taken to be o 06; actual values of the boiler efficiencies are given in Table XX.
The corresponding boiler efficiencies are given in the third column of the table, when they are known, and the combined efficiencies in the fourth column.
The curve was drawn by calculating the thermal efficiency from the above expression for various values of the initial temperature, keeping the final temperature constant at 673°, and then plotting these efficiencies against the corresponding values of the gauge pressures.
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