An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 443
hase machines are more efficient. Finally,the single-phase motor has of itself no starting torque andhence will not start from a standstill unless provided withspecial starting devices, which make its construction morecomplicated and expensive than a polyphase machine of thesame rating. There are… … V Connection Block Spring
Electricity · Magnetism
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