Illustration depicting a Semaphore Signal on an American railroad. One arm governs several tracks, the number of the track which is clearly shown on the indicator disk. The safety position was with the blade at 60 degrees in the lower quadrant. Dated 19th century

Illustration depicting a Semaphore Signal on an American railroad. One arm governs several tracks, the number of the track which is clearly shown on the indicator disk. The safety position was with the blade at 60 degrees in the lower quadrant. Dated 19th century
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DETAILS
Image Number: 1746-29011801Rights ManagedCredit Line:World History Achive/Image Asset Management/World History Archive/SuperStockCollection:Image Asset ManagementContributor:World History AchiveModel Release:NoProperty Release:NoResolution:4014×5224
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