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296 MOLESWORTHS POCKET-BOOK
Iron Piles for Retaining AValls.
Main piles, 7 feet apart; 1 foot 6 inches wide;
metal, 2 inches thick, with 2 ribs 8 inches deep.
Plates, 7x5 feet, X 1 inch; with diagonal
feather, 6x1.
Diameter of tie-rods, 2 inches.
Breakwaters.
PLYMOUTH.
PLYMOUTH BBEAKWATER.
Depth of water, high tide, 46 ft. 6 in.
„ low „ 30 ft.