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GROUP XXVI 63 DESIGNS CONCERNING THE PORT OF HAVRE, CITADEL BASIN. Report.—These exhibits consist of a basin with two locks, three dry-docks, two swinging bridges, and a set of flushing gates. It would be difficult to find a more complete collection of hydraulic works, or one whose planning and execution better satisfy all the requirements of maritime traffic, and which gives evidence of more thorough study and skillful engineering. DESIGNS CONCERNING BAYONNE HARBOR. Report.—The improvement of Bayonne harbor at the mouth of Adour River, which is obstructed by a drift-bar, has been secured by the construction of open jetties, for which iron tubes have been sunk to a great depth into the sand by pneumatic apparatus. The details of construction, as well as the general scheme, are of great interest, and deserve to be commended as a valuable contribution to the art of civil engineering. DESIGNS CONCERNING THE IMPROVEMENT OF THE “SEINE MARITIME.’* Report.—The results procured on Lower Seine, between Havre and Rouen, by which navigation has been greatly improved and a vast extent of low lands reclaimed, consti tute one of the most interesting illustrations of the system of parallel embankments applied to the improvement of rivers. They are well worthy of the study of all engineers in charge of such works. MODEL OF A WEIR WITH FALLING SHUTTERS, ON THE RIVER MARNE. Report.—The system of movable wickets, as represented by the model, and first applied to the canalization of the river Marne, is one of the most valuable inventions in hydraulic engineering, and it is of the greatest utility in the improvement of rivers, its efficiency and perfection of working having been sufficiently tested by the experience of the past eighteen years. MODEL OF A DAM AND SIPHON WEIR AT THE MITTERSHEIM RESERVOIR. Report.—The reservoir at Mittersheim, constructed in order to supply a part of the Seine collieries canal, is intended to contain seven million cubic meters, and to operate under such conditions that the capacity of the water-fall could never be exceeded. The reser voir dam is conspicuous for its excellence of execution. The level-regulating automatic apparatus, consisting of two siphons governed by two smaller ones, is very ingenious, and does great credit to its author. PERSPECTIVE VIEW OF ST. NAZAIRE HARBOR, AND MODELS. Report.—The port of St. Nazaire, created thirty years ago for the accommodation of transatlantic commerce, is a seaport where the most serious difficulties, not only in con struction, but also in maintaining the required draught of water by dredging, have been successfully surmounted by the skill of the engineers in charge of the works. The models and designs of timber and iron gates for locks, twenty-five meters wide, ten meters high, are very remarkable for their good arrangement and execution. MODEL OF CANAL BRIDGE OVER THE RIVER ALBE. Report.—The model exhibited represents a part of an iron canal bridge built over the river Albe. The arrangement of the iron-framed basin, and the means by which at the junction with the masonry the leaks are obviated, are very remarkable.
