Advantages of low frequency are claimed to be possibility of using standard d. c. apparatus, economy in installation, improvement of power factor and greater variation in operating values of apparatus.
Supply and transmission for modern railway signalling
Ry. Engr
Railway Engineer ; 40 , n 472
1919
4 pages
2 Figs.
Article (Journal)
English
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Supply and transmission for modern railway signalling -- II
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