Telegraphy
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Colligan and Linley 2011 -- Ivan Raykoff chapter on piano interface in early telegraphs, typewriters, and player pianos
Kieve 1973 -- British history of the telegraph
see Arthur C. Clarke, How the World was One (1992) https://archive.org/details/howworldwasonebe0000clar_l7b2
see Gabler, The American Telegrapher (1988)
see Prescott, History Theory and Practice of the Electric Telegraph (1860)