With the compilation, in 1790, of Howe's second signal book, we have the end of that system, or want of system, which is especially noticeable during the American War of Independence, under which the signals used in each fleet or squadron varied with the idiosyncrasies of each individual commander-in-chief. Henceforth, although it was usual for the admiral commanding each fleet to add a few of his own devising, the bulk of the signals were, so to speak, stereotyped in form, and were in general use throughout the British navy.
In 1799 the _Signal Book for the Ships of War_ was increased in size to 167 pages by the addition of an index to the signals and the inclusion of the printed instructions. The "Private ship" signals were placed at the end of the "Admiral's signals" and numbered consecutively after them, so that the "tabular" flags disappear, and all signals are henceforth made by the simple numerary code, the total number being increased from about 260 to 340.
It will be seen from the plate of numeral flags that Howe's numerals were continued in the 1799 book with only two slight modifications: No. 1, instead of being a plain red flag, became yellow, red, yellow, in three equal horizontal stripes, and the substitute became plain white. But his arrangement was simplified. The half black and white flags were done away with as unnecessary, since their meanings could equally well be expressed by those remaining.
In addition to the signal book, each commander-in-chief compiled for his own fleet a tabular "pendant board," on which two pendants were assigned to the name of each ship of his fleet. By this means he was enabled to address any of the signals to a particular ship, without making the command general to the whole squadron. For example, Nelson, at Trafalgar, before making general his favourite signal, "Engage the enemy more closely," addressed it particularly to the 'Africa,' which, having become separated over night, found herself at a distance from the two columns, and, just before the commencement of the action, was sailing near to the enemy's van, on an opposite and parallel course. This he did by hoisting flags Nos. 1 and 6, together with the pendants appropriated to the 'Africa's' name on the "pendant board."