Another copy, also in the Admiralty Library, is attested by Gambier, Sir John Colpoys and Admiral Philip Patton, and countersigned by the new second secretary, John Barrow, all of whom came to the admiralty under Lord Melville on Pitt's return to office in 1804.
Two other copies are in the United Service Institution.
[3] Sir Home Popham's code had been in use for many years for 'telegraphing.' It was by this code Nelson's famous signal was made at Trafalgar.
[4] In one of the United Service Institution copies the signal has been added in MS.

and the note is on a slip pasted in.

In the other both signal and note are printed with blanks in which the distinguishing pennants have been written in.
[5] Nelson to Howe, January 8, 1799.

_Nicolas_, iii.

230.
[6] Sir Charles H.Knowles did modify his code in this way some time after 1798.