Great Exhibition of 1851: Facts and Figures, Companion to the Almanac, London, 1852, pp. 20-40. 
http://babel.hathitrust.org/cgi/pt?id=coo.31924106525128

Excerpt, pp. 38-39, http://babel.hathitrust.org/cgi/pt?id=coo.31924106525128.