A diagram of Cowpers writing telegraph. Invented in 1878 by William Cowper (1819-1893), the machine was able to reproduce a message written some distance away by a process of interrupted electrical currents. This principle extended to recreating a hand-written message as a pencil transposed the movements of the current.
px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP23728346
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
Same folder images: