1851 Great Exhibition: Official Catalogue: Class VII.: J. H. Hearder
205. HEARDER, J. H., 34 George Street, Plymouth.
Rarefying apparatus, for producing a draught in the underground flues of stoves or ventilating shafts, etc.
Model (scale, inch to the foot) for a dockyard, curved iron roof, for man-of-war ship building. The two preceding models were submitted to the Admiralty by the exhibitor.
Models and sections of the structures proposed for the Great Exhibition Building, by the exhibitor. One of these is the only model out of the 243 submitted in competition, that had the Transept, which with the Nave was to be semicircular, and was all throughout 110 feet high in the centre.
Brass model of one of the modes of constructing the 200 feet dome of metal zones and ribs, with wrought-iron chain bars within, by the exhibitor.
Double range of columns and galleries, to form the support in lieu of walls for the said 200 feet dome.
Models of a railway, a range of conservatory, and a round conservatory. (With Class 6.)