Chap. VIII.
517
64 large chain bars, each 7$ feet long, 4 inches wide, inches thick, and each
bar weighing 150 pounds; for the five - 48,000
384 chain plates, 18 inches long, 10 inches broad, 1J inches thick, and each
weighing 126 lbs. ------ 28,000
128 large bolts, each weighing 126 lbs. - 16,128
123 chain bars, 10 feet long, 3J inches wide, 1 inch thick, each weighing 124 lbs.;
for the five ------- 76,260
738 chain plates, 16 inches long, 8 inches broad, and 1 inch thick, each weighing
32 lbs. ------- 23,616
246 bolts, each weighing 56 lbs. ----- 13,776
597 connecting rods and bolts, each weighing 37 lbs. - - - 16,119
16 steadying ties, each weighing 1225 lbs. - 19,600
Total weight of one chain (121 tons 299 lbs.) - 242,299
And for the whole sixteen chains, 3,876,784 lbs., or 1,938 tons 784 lbs.
2 cast-iron plates under the saddles, each weighing 46,080 lbs.
8 saddles, each weighing 3248 lbs. -
20 tie bars for the saddles, 20 feet long by 3 inches square, each weighing600 lbs. -------
64 rollers, each weighing 335 lbs. -
16 guide plates and brass bushes, each 373 lbs. -
199 suspension rods, averaging 33£ feet in length, 1 inch square, and each rodweighing 111 lbs. ; for the four sets -
111 sleepers, each weighing 334 lbs. -222 trussed rods, each weighing 40 lbs. -
222 king posts, each weighing 7 lbs. -
. . . , f 98 side rails, each of 80 lbs. weight -
nglesea si e. |^98 foot rails, each of 50 lbs. weight -Suspended portion, 222 side rails, each of 10 lbs. weight^ , f 74 side rails, each of 65 lbs. weight - - -
aernarvon si e. 74 f 00 j. ra j] s ^ G f 50 lbs. weight -
6 cast-iron frames for fastening in the rock, each weighing 2240 lbs. -24 round bolts, 9 feet by 6 inches, each weighing 444 lbs.
""78 side rails of road, weight 80 lbs. each24 centre do. weight 50 lbs. each78 cast-iron stanchions to support rails, weight 176 lbs.
24 do. weight of each 100 lbs. -
39 hand-rails, weight of each 104 lbs.
’38 side rails of road, weight 80 lbs. each
40 cast-iron stanchions, weight of each 176 lbs.
38 hand-rails, weight of each 104 lbs.
484 cast-iron parapet rails, weight of each 31 lbs. -
4 sets of cast-iron saddles, weight of each 2016 lbs. -
8 gate posts, weight of each 533 lbs. -
4 toll gates, weight of each 325 lbs. -
2 lamp-posts, weight of each 300 lbs. -
12 tie bars in the pier arches, weight of each 533 lbs. -32 cast-iron saddles about the toll-house on the side of Caernarvonshire , weightof each 416 lbs. ------
4 plates under the last-mentioned saddles, weight of each 900 lbs.
240 segment saddle bars on the piers, and near the Anglesea toll-gate, weight ofeach 200 lbs. - -
Side of Anglesea.
Side of Caernarvon.
92,160
25,984
12,000
21.4405,968
88,356
37,074
8,880
1,554
7,840
4,900
14,430
5,920
3,700
13.44010,656
6,240
1,200
13,728
2,400
4,056
3,040
7,040
3,952
15,004
8,064
4,264
1,300
600
6,296
13,312
3,600
48,000
496,468
Add to this the weight of the sixteen chains - 3,876,784
Total weight of iron - 4,373,282
Or 2186 tons, 1282 lbs.
Conway Bridge is upon the same principle as that over the Menai Strait. The distancebetween the points of suspension is 327 feet; the depression or versed sine of curvatureof the main chains is 22 feet 6 inches; the number of chains is eight, each having fivebars, 3\ inches by 1 inch, making together a total of 130 square inches of transverse section.The roadway is in breadth 17 feet 6 inches, and is 15 feet above the level of high water;it consists of a carriage-way without any separate footpath.
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