Although system of operating semaphore signals was invented to meet and defeat predatory habits of Chinese bandits, it should prove interesting and useful under variety of normal conditions which will readily suggest themselves to railway signal engineers; system is invention of J. H. Williams.
A new method of operating semaphore signals
Engineer
Engineer ; 144 , n 3755
1927
2 pages
5 Figs.
Article (Journal)
English
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