N-0000.193.140.1 | From no. 11 dam, showing no. 10 pier and staging for tubes, Victoria Bridge, Montreal, QC, 1859

 
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Photograph
From no. 11 dam, showing no. 10 pier and staging for tubes, Victoria Bridge, Montreal, QC, 1859
William Notman (1826-1891)
1859, 19th century
Silver salts on paper mounted on card - Albumen process
7.3 x 7 cm
Gift of Mr. James Geoffrey Notman
N-0000.193.140.1
© McCord Museum
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Keywords:  Architecture (8646) , bridge (558) , Construction (163) , Photograph (77678)
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Keys to History

Before a tube could be put in place, temporary scaffolding had to be built to support the work. To effect this, from one to three cribs were built and sunk between the two piers. The scaffolding, built on top of the crib, had fan-shaped timbers to support a floor upon which the tube was built. The timbers used in the scaffolding were hoisted into place by a "floating derrick," essentially a boom crane, driven by horse or steam power, mounted on two barges fastened side by side.