Michigan Avenue lift bridge - photo

[Altair]

Michigan Avenue lift bridge in Buffalo, New York, c. 1900.

Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg



Previously:

World's heaviest lift bridge - photo and video
How bridges are constructed in the 14th century - GIF
1937 Golden Gate Bridge opening with cutting torch - photo
Golden Gate bridge cable cutaway - photo
Gateshead Millennium Bridge tilting - GIF

[DIYSwede]

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...



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