Excerpt from The Practical Telephone Handbook and Guide to the Telephonic Exchange

This standardisation, and the general adoption of central energy working, has led to a more scientific study and treat ment of the problems involved, especially In connection with traffic and the designing of exchanges.

The necessities of central-energy working and the line loading arrangements of Professor Pupin and others have also led to more definite appreciation of the value of the best line construction, and to the better designing of lines for economical transmission.

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