Engraving depicting a Morse telegraph transmitting key. Simple brass lever mounted on a hinge A, with a spring at F, to lift a lever when operator releases a button K, to break contact/current at C, D. P, wired to battery, L, line wire, R, wired to indicator/relay. Dated 19th century.
| px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP21947831
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
No
Property Release:
No
Right to Privacy:
No
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