The fact that no further development on old lines was possible was, no doubt, widely comprehended; for Admiral Sir Chas Knowles tells us that it was the Marquis of Hastings, an officer in the Army, then in America, who first advised him to "strike out something new." The first steps in the new direction were taken about 1778 by Kempenfelt, Howe, and Sir Chas Knowles, each acting more or less independently. There is no need to waste time in discussing the rival claims of these admirals to be the inventor of the numerary method, because as a matter of fact this method of denoting signals had been invented by Mahé de la Bourdonnais, 40 years before, for use in the struggle he was preparing to wage with us for the mastery of India and the East Indies. La Bourdonnais was one of the most brilliant and versatile officers that France has produced; but he was of somewhat obscure birth when compared with the high nobility who at that period officered the French navy, and he had been admitted to their ranks by a back door, having first served in the French East India Company. Fortunately for Great Britain, the jealousy of Dupleix and of La Bourdonnais' high-born brother officers thwarted his plans, and finally resulted in his recall to France. His signals seem never to have been adopted[381], but the system is described by Bourdé de Villehuet in his book, _Le Manœuvrier_, published in 1769, one of the classic works on tactics of the eighteenth century. It is evident from an extract in one of his letters to Lord Barham that it was from this source that Kempenfelt became acquainted with the system.
The claim of Admiral Sir Chas Knowles to have "discovered the signals by numbers" in 1778, which numeral signals he gave to Lord Howe on his arrival at Newport, Rhode Island, may therefore be dismissed, so far as discovery is concerned, but his claims to have "discovered the tabular flags (suggested by a chessboard)" may possibly hold good.
Sir Chas Knowles's signals were not adopted in the navy, but as we shall find "tabular flags" used in the Signal Books of Howe, it will be well to explain the two methods.
When a signal code has been drawn up and the signals have been numbered consecutively, the numbers may be represented by flags in two different ways.