N&W Semaphore Signal Question

[NW Mailing List]

On N&W Style B (lower quadrant) and Style S (upper quadrant) semaphores, were the semaphore arms ("blades") made of wood or pressed steel? 

(Orders could be shipped with either, as specified by the purchaser.) 

-- abram burnett 

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Successor to the MAGNETIC TELEGRAPH LINE of 1844 
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