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-*y.-.rry j ^*rcM.yrr^ag- .M&r-yf 'mr m Wx' ;c» ja*k-h*- •... GROUP XXVI. Model of Minot's Ledge Light-House, Entrance to Boston Bay. This is a good specimen of a light-house, built of granite, ninety-two feet high, and stand ing in twelve feet of water at high tide. Its base is built solid for a considerable height, and the lower courses of stone are banded by a system of dovetailing differing from that adopted by Smeaton at the Eddystone or by Stevenson at the Bell Rock, but it seems as effective. Lens of second order, visible sixteen miles; fog bell struck by machinery. Model of Iron Screw Pile Light-House, Florida Reef First order lens, visible eighteen miles, light scintillating every five seconds, flashing red every sixth second. Model of Iron Screw Pile Light-House on Brandywine Shoal, Delaware Bay. Lens third order. Fog signal bell struck seven blows at intervals of six seconds, then a pause of thirty seconds. Model of an Iron Light-House on Sombrero Shoal, Florida Reef. Built of iron columns standing on iron disks resting on a coral foundation. ’ Lens of first order, light fixed, white. Light-House at Southwest Pass, Mississippi River. Constructed of iron columns standing on a stone base, the masonry being built in a wooden crib. Model of Spectacle Reef Stone Light-House, Lake Michigan. The model shows method of construction, which was by using a coffer dam within a wooden crib. Range of light sixteen and three-quarter miles, alternate red and white; a ten-inch steam fog whistle. Light-House Iron Tower on North Pier of Chicago Harbor. Third order lens, eighty-three feet high, visible sixteen miles, fixed white light. These light-houses are all good specimens of their kind. Exhibited with the models of the light-houses are fine specimens of lenses of the first, third, fourth, and fifth orders. The lens of the first order, white, flashing every ten seconds. Model of the United States Iron Shipping and Landing Pier, Delaware Breakwater. Constructed of iron screw piles, in a soft bottom of sand and mud. Engineer, Lieutenant-Colonel Kurtz, U.S.A. Harbor of Refuge, Lake Huron. This is a work of considerable magnitude, having a breakwater seven thousand feet i° n o> an d an arc ot twelve feet of water of three hundred and twenty acres. The breakwater constructed of crib work. Engineer, Major Weitzell, U.S.A. A Model of the Crib Work used in constructing the Breakwater in Oswego Harbor, Lake Ontario. Engineer, John M. Wilson, U.S.A. A Model of the Crib Work used in constructing the U.S. Breakwater at Dunkirk, N. E, Lake Erie. Colonel C. E. Blunt, for Major F. Harwood, U.S.A.