1851 Great Exhibition: Official Catalogue: Class VII.: C. Todd
From Graces Guide
52. TODD, C., Leeds — Inventor and Designer.
Model of a girder (with Classes 5 4. 6), or the vertebral arch, representing its most simple form; originally invented and designed for a bridge to cross the river Mersey, at Runcorn Gap, in one span of 1,263 feet. The span of the arch of this model is 31 feet, being about 1/40th of the span proposed for the bridge. The principle wan suggested by considering the construction of the back-bone of an animal.
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