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

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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DETAILS
Image Number: 1746-29011803Rights ManagedCredit Line:World History Achive/Image Asset Management/World History Archive/SuperStockCollection:Image Asset ManagementContributor:World History AchiveModel Release:NoProperty Release:NoResolution:5737×3655
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