19 JANUARY 1878, Page 15

SIGNALLING AT SEA. [To THE EDITOR OF THB"SPECTATOR."] Stn,—In the

account of Mr. S. Harrison's method of signalling at sea—the Abacus system,—published in your journal of the -5th inadvertently wrote " right " for " left " and vice versa, throughout the description of the consonant signals. This was the more inexcusable, that you had already pointed out another clerical error. Fortunately, by correcting the illustrative signal-word, you saved your readers from the confusion which my blunder would otherwise have caused them. The error, in fact, would scarcely need noticing, as it does not affect the simplicity .of Mr. Harrison's method, were it not that it somewhat affects the symmetry of the method, by introducing a difference between the use of the right and left side of the signal-board for vowels and consonants.—I am, Sir, &O., THE AUTHOR OF THE ARTICLE.