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Michigan Avenue lift bridge in Buffalo, New York, c. 1900.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ver_bridge.jpg
Previously:
https://www.homemadetools.net/forum/...796#post140221
https://www.homemadetools.net/forum/...337#post169460
https://www.homemadetools.net/forum/...845#post163878
https://www.homemadetools.net/forum/...109#post141264
https://www.homemadetools.net/forum/...098#post130136
Now that's a very rare and interesting piece - a Belidor bascule bridge, a rolling counterweight double-leaf bascule bridge,.
Reason for construction: A perfectly counter-balanced bascule bridge, needing a minimum of work to lift.
Guess the first US example of this type was Berry's Creek, N.J. bascule bridge...
Attachment 38313
PDF from Railroad Gazette, Nov 27th 1896 describing the theory, design and function of this type:
Bélidor bascule railroad bridge - Meccano Gallery
2 cents
Johan
Links:
Animated operation: https://mathcurve.com/courbes2d.gb/p...ontlevis.shtml
US last remaining example: https://historicbridges.org/bridges/.../glimmerglass/
The Aussies had the intrepid bridge designer Harvey Dare:https://portal.engineersaustralia.or...ge_Maclean.pdf
Attachment 38312
