March 28th. 'A telegraph was this day erected over the Admiralty, which is to be the point of communication with all the different sea-ports in the kingdom. The nearest telegraph to London has hitherto been in St George's Fields; and to such perfection has this ingenious and useful contrivance been already brought, that one day last week information was conveyed from Dover to London in the space of only seven minutes. The plan proposed to be adopted in respect to telegraphs is yet only carried into effect between London and Dover; but it is intended to extend all over the kingdom. The importance of this speedy communication must be evident to every one; and it has this advantage, that the information conveyed is known only to the person who sends and to him who receives it. The intermediate posts have only to answer and convey the signals.' The machines used consisted of three masts connected by a top-piece. The spaces between the masts were divided into three horizontally, and in each partition a large wooden octagon was fixed, poised upon a horizontal axis across its centre, so that it could be made to present either its surface or its edge to the observer. The octagons were turned by means of cranks upon the ends of the axles, from which cords descended into a cabin below. By the changes in the position of these six octagonal boards, thirty-six changes were easily exhibited, and the signal to represent any letter or number made: thus, one board being turned into a horizontal position so as to expose its edge, while the other five remained shut or in a vertical position, might stand for A, two of them only in a horizontal position for B, three for C, and so on. It was, however, found that the octagons were less evident to the eye at a distance than the indicators of Chappe's machine, requiring the stations to be closer together; nor could this telegraph be made to change its direction, so that it could only be seen from one particular point, which necessitated having a separate machine at the Admiralty for each line, as well as an additional one at every branch-point. It was, moreover, too bulky and of a form unsuitable for illumination at night. Here we may notice that in 1801 Mr John Boaz of Glasgow obtained a patent for a telegraph which effected the signal by means of twenty-five lamps arranged in five rows of five each, so as to form a square. Each lamp was provided with a blind, with which its light could be obscured, so that they could be made to exhibit letters and figures by leaving such lamps only visible as were necessary to form the character.