View of the telegraph erected on the Admiralty Office Charing Cross in Feby

An explanatory design of the telegraph, built for the transmission of messages, over the Admiralty, Whitehall; the main image shows the telegraph on top of the Officer's Cabin with all the shutters closed; engraved lettering below, and around the edge, lettered from A to R, are further smaller telegraphs with shutters open in various different positions according to the specific letter signalled. Inscribed with letters above and within images, and with five short paragraphs of lettering below main image, three with the heading: "Explanation of the Telegraph / The Alphabet explained / Sentences explained".