An essay on the different modes of communication by signals; containing an history of the progressive improvements in thisart, from the first account of beacons to the most approved methods of telegraphic correspondence...
By: by J. Gamble, A.M. Fellow of Pembroke College, Cambridge.....
Publisher: printed by S. Gosnell, for W. Millar
Published: 1797
Place of publication: London
Language: eng