CONCRETE MINNS ON TEE CANAL WESTIN° SELLA LONELLINA ITALY. The importance of concrete made water cement as a sub stitute for brick or stone in the construction of hydraulic works is now beginning to be more fully recognized by Italian engineers. A few notes on some important works of this class that have recently been carried out for the Canal Cavour Company on the extension of the branch canal Quintino Sella will not fail to prove interesting to our read ers. In consequence of the scarcity of bricks and the short time (four months) that was allowed for the construc tion of this canal the company determined to accept the proposal of Signor Giuseppe Frattini—who has successfully introduced the use of cement concrete into Italy for the con struction of hydraulic works—to build all the siphons for the passage of existing irrigation channels under the new The dials are ten feet in diameter each hour being cut in relief from a single block of stone. The hour hands are four feet in length and the minute hands about five feet four inches. The clock is forty feet above the dials and the movements of the hands work through long tin tubes encased in oak. There are la the clock tower three large cylinders carrying steel and brass cog wheels the largest wheels being two feet six inches in diameter and the small est being seven inches. In all there are twenty seven wheels not counting the friction rollers. The pendulum rod is made of wood twenty-one feet in length and having at the lower extremity about five feet swing. In this there is a trade secret. Wood shrinks sideways while iron steel brass and other metals shrink in all directions. Therefore wood well seasoned and waxed is used for tower clock pen dulums. Three weights are used hung at the ends of H. The latter then rotates in the direction of the arrow on the carried over to engage with the opposite wheel. The valve E is consequently rotated in the contrary direction compressing the air in the annular chamber K whic
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