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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Model of Liverpool and Manchester railway day and night signals. Represents the earliest form of fixed signal, introduced on the Liverpool and Manchester RR about 1834. It consists of a rectangular frame on which a red flag was stretched, fixed to a verticle rod that was mounted in bearings attached to a wooden post. By means of a handle near the bottom the flag could be turned so as to face the engine driver, when indicating danger or set parallel with the rails for safety. Red and white lights placed on posts serve the same purpose at night." The New York Public Library Digital Collections. 1860 - 1920. https://qa-digitalcollections.nypl.org/items/510d47d9-affc-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Model of Liverpool and Manchester railway day and night signals. Represents the earliest form of fixed signal, introduced on the Liverpool and Manchester RR about 1834. It consists of a rectangular frame on which a red flag was stretched, fixed to a verticle rod that was mounted in bearings attached to a wooden post. By means of a handle near the bottom the flag could be turned so as to face the engine driver, when indicating danger or set parallel with the rails for safety. Red and white lights placed on posts serve the same purpose at night." New York Public Library Digital Collections. Accessed November 24, 2024. https://qa-digitalcollections.nypl.org/items/510d47d9-affc-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Model of Liverpool and Manchester railway day and night signals. Represents the earliest form of fixed signal, introduced on the Liverpool and Manchester RR about 1834. It consists of a rectangular frame on which a red flag was stretched, fixed to a verticle rod that was mounted in bearings attached to a wooden post. By means of a handle near the bottom the flag could be turned so as to face the engine driver, when indicating danger or set parallel with the rails for safety. Red and white lights placed on posts serve the same purpose at night. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47d9-affc-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47d9-affc-a3d9-e040-e00a18064a99 | title=
(still image)
Model of Liverpool and Manchester railway day and night signals. Represents the earliest form of fixed signal, introduced on the Liverpool and Manchester RR about 1834. It consists of a rectangular frame on which a red flag was stretched, fixed to a verticle rod that was mounted in bearings attached to a wooden post. By means of a handle near the bottom the flag could be turned so as to face the engine driver, when indicating danger or set parallel with the rails for safety. Red and white lights placed on posts serve the same purpose at night., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=November 24, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>