With view to laying foundation of study on relays for railway signals, author enumerates various kinds of d-c relays hitherto adopted by State Railways, and describes briefly their progress, design, construction and characteristics. See also pt I indexed in Engineering Index 1940 p 1000, from Bul v 28 n 8 Mar 25 1940.
Investigation of relays for railway signals (Pt II -- Summary Report on direct current relays)
Japanese Gov Rys -- Bul
Japan Department of Railways -- Bulletin ; 28 , n 17
1940
51 pages
Article (Journal)
Japanese
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Investigation of relays for railway signals (Pt I -- Summary report on alternating current relays)
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