Electrical machinery; a practical study course on installation, operation and maintenance (1921)
Annett, Fred Anzley · New York [etc.] McGraw-Hill book company · leaf 397
medium voltages either type may be 380 ELECTRICAL MACHINERY used, but for very high voltages most all transformers are ofthe core type. The iron core is not made of a single piece of solid ironbent into shape, as indicated in Fig. 440, but is built up ofmany pieces of sheet iron that are stamped to…
Electric machinery
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