Wood-engraving showing one of the iron tunnels which would be placed in the River Thames linking Waterloo to Whitehall for the "modern pneumatic" railway.
Note, the scale is probably not exact as Victorians tended to exaggerate the size of their constructions. The actual size is about 16 feet wide and 221 ft. in length. They were sealed at each end and would have been floated to their eventual location.
Notable things to make out are the very defined iron sections with the plates where they are riveted together. Also, you can make out a brick "shield" which would be built around the outside of the tube to protect the iron from moisture being already in place on one section. The print is from the front cover of Scientific American of 1867, March 16 (Volume 16, Issue 11).
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A drawing which shows one of the iron tunnels which would be placed in the River Thames linking Waterloo to Whitehall for the "modern pnumatic" railway. Note, the scale is probably not exact as Victorians tended to exagerate the size of their contruction