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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pulse machines : an ingenious mechanism associated with the senders and translators which supplies them with various kinds of electrical impulses required for their operation." The New York Public Library Digital Collections. 1860 - 1920. https://digitalcollections.nypl.org/items/510d47d9-b19b-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Pulse machines : an ingenious mechanism associated with the senders and translators which supplies them with various kinds of electrical impulses required for their operation." New York Public Library Digital Collections. Accessed April 24, 2024. https://digitalcollections.nypl.org/items/510d47d9-b19b-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Pulse machines : an ingenious mechanism associated with the senders and translators which supplies them with various kinds of electrical impulses required for their operation. Retrieved from https://digitalcollections.nypl.org/items/510d47d9-b19b-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47d9-b19b-a3d9-e040-e00a18064a99 | title=
(still image)
Pulse machines : an ingenious mechanism associated with the senders and translators which supplies them with various kinds of electrical impulses required for their operation., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=April 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>