. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 182 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [Junk, comfortable residence for the light-keepers, whilst affording you a steady, bright, uniform light, 45 feet above mean-sea level,—ranging over an eight- mile horizon, visible 10 miles from a coaster's deck, and freed from those breaks of brilliancy attending the offing passage from reflector to reflector, by being fitted with a light of ' Dioptric' order. Foggy periods are provided for by a self-acting deep-sounding bell,
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 182 THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. [Junk, comfortable residence for the light-keepers, whilst affording you a steady, bright, uniform light, 45 feet above mean-sea level,—ranging over an eight- mile horizon, visible 10 miles from a coaster's deck, and freed from those breaks of brilliancy attending the offing passage from reflector to reflector, by being fitted with a light of ' Dioptric' order. Foggy periods are provided for by a self-acting deep-sounding bell, tolling three strokes of five-second intervals, at one minute pauses; and tide-time for vessels of 12-feet draft, is denoted by 2 black halls being kept upon its flag-staff until 12-feet ceases upon the straight course, right up ; at the same time, however, denoting 17 feet up through the buoyed channel; and vessels requiring a Wyre pilot will be understood at this lighthouse, if showing a weft at the peak, besides their pilot-jack at the mast-head; whence, a pilot-jack will also be hoisted until she is provided. The Wyre pilot-boats are of sloop and yawl rig, with black bottom, while top-sides and black streak, with her number and the letter F on the mainsail. Tlicir cruising ground extends from Formby Point to Haver- ing Point of Duddan. ELEVATION OF WYRE REFERENCE. A, Marl formation ; the screws are 10 feet below low water mark. B, Sub-stratum of sand. C, Low water equinoctial springs. D, Low water ordinary tides, 2 feet above ditto. E, Ditto neap tides, 9 feet ditto. F, Half-tide level, 15 feet ditto. G, High water neaps, 21 feet ditto. H, Ditto ordinary tides, 28 feet ditto. J, Ditto, equinoctial springs, 30 feet ditto. K, Underside of platform, 45 feet ditto. Centre of the Dioptric Light in Lanthem 60 feet ditto. . of the abort Screw Pile Lighthouse, erected on the north- eastern lorn-water spit of North Whaif Bank, at the entrance of the Wyre
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