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© The New York Public Library, 2026
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Interborough rapid transit: the New York subway, its construction and equipment
Rare Book Division, The New York Public Library. "1,500 K. W. rotary converter; motor-generator set supplying alternating current for block signals and motor-generator starting set." The New York Public Library Digital Collections. 1904. https://old-digitalcollections.nypl.org/items/510d47dc-9b8c-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "1,500 K. W. rotary converter; motor-generator set supplying alternating current for block signals and motor-generator starting set." New York Public Library Digital Collections. Accessed October 2, 2026. https://old-digitalcollections.nypl.org/items/510d47dc-9b8c-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1904). 1,500 K. W. rotary converter; motor-generator set supplying alternating current for block signals and motor-generator starting set. Retrieved from https://old-digitalcollections.nypl.org/items/510d47dc-9b8c-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47dc-9b8c-a3d9-e040-e00a18064a99 | title=
(still image)
1,500 K. W. rotary converter; motor-generator set supplying alternating current for block signals and motor-generator starting set., (1904)
|author=Digital Collections, The New York Public Library |accessdate=October 2, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>