. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 338 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [October, each.) entt of the single wire above water, and that of the short length attached to the zinc plates, are led to a battery, which for firing charges in 13 fathoms water, should have a power equivalent to 6 cylinders of Daniell's battery; this I found to be the minimum : on completing the circuit, the charge is fired by the transmission of ihe electic fluid down the single wire, igniting the piece of fine pla- tinu
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 338 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [October, each.) entt of the single wire above water, and that of the short length attached to the zinc plates, are led to a battery, which for firing charges in 13 fathoms water, should have a power equivalent to 6 cylinders of Daniell's battery; this I found to be the minimum : on completing the circuit, the charge is fired by the transmission of ihe electic fluid down the single wire, igniting the piece of fine pla- tinum fixed across the priming wires within the bursting powder, and returning by the water, which over the wreck of the "Royal George," completes a portion of the circuit equalling SO feet. This method has now been so frequently tried and without a single failure, that it may be considered as certain and secure, and I consider it superior to that of the double wires, on account of the greater lia- bility of the latter to break, or to be brought improperly in contact, by the shrinking and contraction of the rope after imbibing moisture; the saving of wire, is also a great object, and the single wire may be conveniently coiled on a common log reel, and held in the hand while being passed over the side of a vessel when used on a wreck. This system may be used for charges contained in vessels of tin, iron, copper, or any other conducting metal; but when wooden casks are used, it will be necessary to attach a certain surface of metal to the cask. I annex a sketch of the mode of connecting the single wire with the priming wires, &c. I remain, Sir, Your very obedient servant, G. R. HOTCHIKSON, Lieutenant Roval Engineers. Portsmouth, 10rt September, 1843. Ukferexce. A & B, two single insulated wires; the ends are led to the poles of a voltaic battery in a boat or lighter. C, 3 zinc plates, 10 in. by " in. A, a single insulated wire con- ducted B, a single wire. The
Size: 947px × 2638px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience
