. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. J ot-f-t-y Pig. 4.—Transverse section of a bar, and elevation of heel-post FJg . 5.—Transverse section of the middle of a bar. they are 2 inches thick, 16 inches broad at the ends, and 18 inches wide at the middle, with two double flanches 9 inches broad and 2 inchrs thick on the hollow side, and 11 inch thick on the convex side, excepting the lowest bar, which has only the upper flanch. The bars have cross ends 18 inches in height and 2 inches in thick- ness, with four screw
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. J ot-f-t-y Pig. 4.—Transverse section of a bar, and elevation of heel-post FJg . 5.—Transverse section of the middle of a bar. they are 2 inches thick, 16 inches broad at the ends, and 18 inches wide at the middle, with two double flanches 9 inches broad and 2 inchrs thick on the hollow side, and 11 inch thick on the convex side, excepting the lowest bar, which has only the upper flanch. The bars have cross ends 18 inches in height and 2 inches in thick- ness, with four screwed bolts to each li inch diameter, through the heel and mitre posts. The clap cill is cast in two pieces for each leaf, it is 8 inches deep and 1J inch tliick, with dovetailed snugs cast on it, tailing I) inches into the stone; the joint between the iron cill and the stone, is closely caulked in with iron cement, and the face of the cill is chipped and filed, where necessary, to make it quite fair for the bottom bar to fit upon; the height of the cill above the platform, is 15 inches. The bottom bar is of oak 12 inches thick, 17 inches broad at the ends, and 19 inches broad at the middle ; it is bedded on felt to the lowermost cast iron bar, and is fixed up to it by bolts H inch in dia- meter screwed into the timber. The false mitres fig. 3, are also of oak, fitted closely into the cast iron posts, and fastened by bolts 1 inch in diameter, riveted through the flanches, and they are tongued down into the bottom bars. Both sides of the gates are lined with boiler plates, arranged so as to break joint; the plates of the lower tier, averaging about 6 feet in height, are i inch in thickness, and all above them are -j^^ inch thick ; they overlap each other about 2s inches, and are fastened by rivets J inch diameter foi the lower plates, and i inch diameter for the upper plates, all riveted while hot, and made to fill up the holes completely. The gates are perfectly tight both
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