1. Topping P. ‘A “New” Signal Station in Cumbria’,Britannia, 18 (1987), 298–300; Donaldon, G.H. ‘Signalling Communications and the Roman Imperial Army’,Britannia, 19 (1988), 349–56.
2. Mallinson H.Send it by Telegraph: the Old Telegraph during the Wars with France(Ramsbury: Crowood Press, 2005), 21–2, 75–84.
3. [accessed 18 September 2011].
4. An example of an 1870s field telegraph is on display in the Bundeswehr Museum, Dresden.
5. Occomore D.‘Number Please! A History of the Early London Telephone Exchanges from 1880 to 1912(Romford: Ian Henry Publications, 1995), 3–19.