180
ots and dashes can be sent with nearly perfect regularity by an ordinary Morse key, and the corresponding changes in the current at the receiving end of the cable accurately observed.
A system of arbitrary characters, similar to those used upon the Morse telegraph, was employed, and the letter to be indicated was determined by the number of oscillations of the needle, as well as by the length of time during which the needle remained in one place. The operator, who watched the reflection of the deflected needle in the mirror, held a key in his hand communicating with a local instrument in the office, which he pressed down or raised, according to the deflection of the needle; and another operator deciphered the characters thus produced upon the paper. This mode of telegraphing was, of necessity, very slow, and it will not surprise the reader that the fastest rate of speed over the cable did not exceed three words per minute. Still, had the old cable continued in operation a few months longer, experience and practice would have enabled the operator to transmit and receive with very much greater facility. On our land-lines, operators of long experience acquire a dexterity which enables them not only to transmit and receive telegrams with wonderful rapidity, but to work the instruments during storms, when those of less experience would be unable to receive a dot. There is no occupation in which skill and experience are more necessary to success than in that of telegraphing, and at the time the Atlantic cable was laid no experience had been obtained upon similar lines, or with the instruments employed. Now, however, the company can avail itself of experienced operators from lines of nearly equal length, and who will require no time for experimenting, but may commence operations as soon as the two ends of the cable are landed upon the shores of Europe and America.
In the old cable the copper wire was covered but three times with gutta-percha, while in the new it is covered four times with the purest gutta-