Excerpt from Automatic Block Signals and Signal Circuits: American Practice in the Installation and Maintenance of Signals Electrically Controlled, and Operated by Electric or Other Power

All-electric interlocking, a natural development of the older mechanical and electro-pneumatic interlocking, is given the attention that its importance merits. Electric railway signals are described as fully as seems advisable, since they are in a transitory state of rapid progress. Electro-gas and three-posi tion signals, representing the highest development of the art in America, have been treated not only from an electrical stand point, but also from a structural point of view.

This book is intended for the signal and railway engineer, the electrician, and the layman; and it is modestly hoped that it Will appeal to all in any way concerned With signaling.

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