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Signal for railroad crossings...
Signal for railroad crossings...
Item # 631805
January 24, 1885
SCIENTIFIC AMERICAN, New York, January 24, 1885 The front page has "Bridge with Movable Floor System" with an accompanying article. Inside the issue is: "Jenkins' Check Billiard Marker"; "Tregea's Automatic Signal for Railroad Crossings"; "Improved Hyraulic Dredger"; and more illustrations, articles and advertisements.
Complete in sixteen pages, never bound, with some staining along the right margin on the front cover, very mild tattering along the lower right edge, a couple non-archival mends on the reverse of the front page, otherwise in good nice condition.
Category: Post-Civil War
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