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A combined Semaphore and Light Railway Signal.

Illustration depicting a combined Semaphore and Light Railway Signal. When the arm is horizontal the red light shows and 'Danger' is signalled. When the arm is hanging at 45 degrees the green light shows and 'Proceed' is signalled. The right hand view shows the signal at rest. Dated 19th century.
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Título:
A combined Semaphore and Light Railway Signal.
Descripción: Ver traducción automática
Illustration depicting a combined Semaphore and Light Railway Signal. When the arm is horizontal the red light shows and 'Danger' is signalled. When the arm is hanging at 45 degrees the green light shows and 'Proceed' is signalled. The right hand view shows the signal at rest. Dated 19th century.
Crédito:
Album / Universal Images Group / Universal History Archive
Autorizaciones:
Modelo: No - Propiedad: No
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Tamaño imagen:
5737 x 3655 px | 60.0 MB
Tamaño impresión:
48.6 x 30.9 cm | 19.1 x 12.2 in (300 dpi)
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