Single_needle_telegraph_(Rankin_Kennedy,_Electrical_Installations,_Vol_V,_1903).jpg
Summary
Single-needle telegraph instrument. The markings on the dial are Morse code , but not in the conventional "dots" and "dashes" notation. This is the stroke notation used for Cooke and Wheatstone telegraph codes which is more appropriate for needle instruments.
Summary
Description Single needle telegraph (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg | Single needle telegraph (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg | |||||
Date | ||||||
Source | Scan from Kennedy, Rankin (1903 edition (five volumes) of pre-1903 four volume edition.) Electrical Installations , vol. V, London : Caxton | |||||
Author | Andy Dingley (scanner) | |||||
Permission
( Reusing this file ) |
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