The Illustrated London News (December 1850): 396. This illustration of a workman pouring melted lead into the pipes at the base of one of the supporting columns appears on the same page as images of drilling and punching machines. Source: An Internet Archive online version of a copy in the University of Michigan Library. Click on image to enlarge it.
.[You may use this image without prior permission for any scholarly or educational purpose as long as you (1) credit the Internet Archive and the University of Michigan Library and (2) link to this URL in a web document or cite it in a printed one. — George P. Landow]
Last modified 23 August 2017