This treatise is characterised by considerable departures from conventional methods, and it is believed that more new light is thereby thrown on the subject than would otherwise have been practicable.

The work is based on a series of articles just completed in Traction and Transmission, and what usefulness it may possess is due in large measure to the courtesy of many engineers and manufacturers who have so liberally supplied the author with examples of their modern designs.

In a growing subject, in which one adopts improvements to the utmost extent that other considerations permit, thorough con sistency is difficult to attain.

To his friend, Mr Theodore Stevens, EM who has carefully arranged the publication in its present form, the author wishes to express his sincere thanks.

The author trusts that the present volume may in some small degree usefully supplement the excellent treatises of Kapp, Thompson, Arnold, Hawkins and Wallis, and others, which have been so helpful to him in his own practice.

A table of usefully arranged data on copper conductors will be found at the end of the volume.

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