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1868.] Gilbert's Patent Iron Ceiling. Fig. 6. 6*3 Fig. 6. A corrugated iron ceiling paneled, and ornamented with centre-pieces. Fig. 7. Fig. 7 is an end-vkw of the same. Fig. 8. Fig. 8. An iron arch, -with inclined bricks at the haunches against the sides of the upper flanges of the beam, the lower ends resting upon the arched plates, the space between the bricks and beams filled in with concrete, and a light layer of concrete upon the surface of the corrugated arched plates.
