. L'ingénieur civil et architecte's journal, scientifiques et de la gazette. Architecture ; génie civil ; la science. 235 LA FONCTION EN'GINEER JOLRNAL et architecte. [JlLY MOTLEY, PONT SUR L'AVON.. La gravure ci-dessus montre une^desi jn pour un pont de 600 pieds span, M. wliich nriiposes Motley de construire sur la rivière .Vvon iti, Saint Vincent, Iloclis Clifton : il déclare qu'il peut être construit avec un rinjf- 100. À une distance de 80 à 100 pieds du bord du rocher il jiroposes à conduire un certain nombre de pieux de fer, united sulficiently solide pour résister d'une souche de sever

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. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 235 THE CIVIL EN'GINEER AND ARCHITECT'S JOLRNAL. [JlLY, MOTLEY'S PROPOSED BRIDGE OVER THE AVON.. The above engraving exhibits a desi^jn for a bridge of 600 feet span, wliich Mr. Motley nriiposes to construct over the river .Vvon, iit St. Vincent's Iloclis, Clifton: he states that it can be built with- out any cent rinjf. At a distance of 80 to 100 feet from the verge of the rock he jiroposes to drive a number of iron piles, united sulficiently strong to bear a strain of several thousand tons, to which powerful tension-bars would be fastened, on tlie river end of which cranes of sufficient st ength would be attached, and, by the aid of a moveable platform, the first portion of the bridge would be hung on the principle of a suspended bracket; this would con- tinue to be enlarged in length and depth, and as the work would commence on both sides simultaneously, the bridge would meet in the centre, and its perfect rigidity be' effected. The cost of the iron work of such a bridge, Mr. .Motley states, for a span of 600 feet, and to sustain a uniform load of 1000 tons, with perfect »a/ety, would not exceed 30, 000/. A model of the bridge may be sean at the office of the Mining Juumal. in Fleet-street. LAIRDS GALVANISED IRON SECTIONAL BO.A.TS. Mr. Macgregor Laird has communicated to the JK'antical Maga- zine the annexed illustration of iron-built galleys and boats he is now constructing. Mr. Laird sti-.tes that this construction is a simple contrivance to enable mercliant vessels to carry without inconvenience, boats that, in case of need, would save the lives of crew and passengers;—men-of-war, to carry double the number of boats in the si)ace now occupied, discovery vessels to carry large tenders;—travellers to carry boats in the space of a moderately sized trunk;—and merchants trading to the open ports of the Pacific and Indian Oceans to send out l

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