Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 167,701 pages of information and 247,104 images on early companies, their products and the people who designed and built them.
Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,919 pages of information and 233,587 images on early companies, their products and the people who designed and built them.
174. DEMPSTER, HENRY, 1 Cannon Street, Hamburgh Place, Leith.
Drawing of a simple telegraph, being a system of sea signals, which, by means of colours, indicate the letters of the alphabet, numbers, and the points of the compass.
Mast with model flag of the true size.
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