Synchronous and Other Multiple Telegraphs (Classic Reprint): Some Methods of Obtaining Independent Telegraph Graph Circuits on a Single Wire Both With and Without Synchronism - Tapa blanda

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Excerpt from Synchronous and Other Multiple Telegraphs: Some Methods of Obtaining Independent Telegraph Graph Circuits on a Single Wire Both With and Without Synchronism

The subjects included in this volume admit of a natural division into three Parts. The first Part is devoted to the general subject of methods of obtaining independent telegraph circuits by the use of direct and alternating currents on the same wire. This is the first technical description of these methods which has been published, and I have some satisfaction in making them public at the present time because the principles have been tested for a number of years under rather difficult service conditions.

The arrangements of circuits throughout the book are with almost no exceptions not merely theoretical results, but have been successfully operated either in the laboratory or under service conditions. The fact that these results, worked out in detail in the laboratory on artificial wires made to imitate real wires, have afterwards been applied to real wires with almost identical results serves to prove that good results in studying new systems of telegraphy may be obtained in the laboratory. The convenience of this mode of investigation is much greater than is attainable under the most favorable conditions with actual wires.

The nature of these subjects is such that investigation must almost of necessity be experimental rather than largely theoretical; for the number of conditions which must be fulfilled is very great, and to overlook one of them might be fatal to purely theoretical results. There is also a personal element which it is not possible to put into an equation.

The name of this work is perhaps only justified by reason of its brevity. It is evident that only certain phases of these extended subjects can be included in a volume of this size.

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