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Culley, R.S. - A HANDBOOK OF PRACTICAL TELEGRAPHY
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| Schrijver: | Culley, R.S. |
| Titel: | A HANDBOOK OF PRACTICAL TELEGRAPHY |
| ISBN: | |
| Uitgever: | Longman, Green, Longman, Roberts and Green, 1863 |
| Bijzonderheid: | 191 + appr. 20 p. + 13 ¨figures". Original edition. |
| Prijs: | € 250,00 |
| Meer info | "Description of the Translating Apparatus and Universal Galvanometer invented by Cromwell Varley. With 2 sets of plates, 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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