Electricity for everybody; its nature and uses explained (1895)
Atkinson, Philip · New York, The Century Co. · leaf 143
Fig. 57. Fig. 58. In the circumference are projecting teeth, between which,when placed in line, are long grooves, in which the coilsare wound, as shown, and confined either by wooden 128 ELECTRICITY FOR EVERYBODY. wedges above them or by metal bauds round the arma-ture ; armatures of this kind…
Electricity
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