1851 Great Exhibition: Official Catalogue: Class VII.: Joseph Chapman
From Graces Guide
45. CHAPMAN, Jos., Frome — Designer and Manufacturer.
Model of a bridge across the Wylye, at Upton Loyal, Wilts. Span 42 feet. Each parapet is formed by trussing a beam of red pine, on the system of Herr Laves, of Hanover; but to increase its rigidity an additional beam, 9 x 5.5, is bent to form an arc, chord 38 feet, versed sine 23 inches; the ends abutting into cast-iron shoes, through which the outer suspending bolt is made to pass. The solid ends of the trusses have their bearings on stone piers, and the outer transverse girders have bearings on corbels in the abutment walls. The roadway is suspended by inch screw-bolts, and rises nine inches towards the centre.
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