Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 221
£ 3 … 206 ELECTRICITY FOR EVERYBODY. Hence it will be seen that each sounder responds tothe manipulation of the key at the opposite station, as insingle transmission, but is unaffected by the manipula-tion of the key at the home station ; so that there can besimultaneous transmission in opposite…
Electricity
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