A Handbook of Practical Telegraphy [With illustrated "Description of the Translating Apparatus and Universal Galvanometer invented by Cromwell Varley" appended]

Published by Longman Green, 1863

  • First Edition
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Seller: Mythos Center Books, Frontenac, MN, U.S.A.Mythos Center Books

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Item description from seller

Scarce copy of original edition. Very good, with minor tears to spine, restored. Brown cloth, with embossed frieze. 191 pages with the addition of: "Description of the Translating Apparatus and Universal Galvanometer invented by Cromwell Varley. With 2 sets of plates, 7, and 13, some folding. With short preface by Varley, dated October 20th, 1863: "In the following pages will be found a full description of my metod of arranging the Translating Apparatus. The system of working by the reversal of the battery currents renders the relays self-adjusting; consequently the variation of the strenght of the currents from humidity of the insulators, &c., seldom necessitates any alternation in the adjustment of the relays.The construction of my Universal Testing Apparatus and its application to the various modes of testing the condition of over-ground, subterranean, and submarine wires, and for ascertaining the locality of faults in either of them is also fully described, and diagrams given which illustrate the various connections necessary for each particular test". Varley also applied his Galvanometer to the "testing" of spiritualist phenomena (not in this pamphlet).…

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Bibliographic details

Title
A Handbook of Practical Telegraphy [With illustrated "Description of the Translating Apparatus and Universal Galvanometer invented by Cromwell Varley" appended]
Author
Culley, R.S.
Publisher
Longman Green
Publication year
1863
Condition
Good
Edition
First edition .

Mythos Center Books

Frontenac, MN, U.S.A.

5-star seller

AbeBooks seller since January 30, 2012

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Mythos Center Books is a research archive connected with Mythos Center, specializing in the areas of folklore, mythology, comparative religions, psychology, sociology, and depth psychology. Established 1990. Please send us with your want lists in these fields. As of 2025, we are dispersing the Mythos Center research collection.

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Mythos Center Books

MN, U.S.A.