Phosphor-Bronze.--We have referred to the results of experimental trials with the new alloy, " phosphor-bronze." We obseryed that the phosphor:bronze had been employed to advantage for the great bearings of the plates in general roiling mills, and for conical gearing in universal rolling mills, in cases where the rollers weighed five tons. It was found that the gear, when made of hard east-iroh, broke frequently; this was replaced by wheels of ordinary bronze, and finally by wheels of

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... ronze. The duration of the ordinary bronze wheels did not exceed, on an average, five months, while those made of phosphor-bronze lasted for about nine months. The phosphor-bronze has also been applied not only in the making of pinions but in the driving axles of mills ; in the latter case the superiority seems to depend not on the hardness, but upon the very great resistance of the alloy. To form a just idea of the value of this remarkable substance, no better evidence could be offered than the estimate placed upon it by the several juries in the mechanical department of the Vienna :Exposition, where it obtained the following awards, viz. : In group 1, for cog-wheels, tuyeres, and bearings, the diploma of merit ; in group 7, for revolvers and parts of harness, the medal of progress ; and in group 12, for its application ta..guns and other material, the medal of merit. Unlike other alloys, it can be remelted without any material loss or deterioration of quality ; while heavy steel castings on the other hand, when worn out or broken, are comparatively worthless. A great variety of objects hitherto worked in iron and steel may now be cast in phosphor-bronze with advantage, and in many cases they required only a polish to make them ready for use ; in addition to which they possess the merit of not corroding. Its great fluidity, compactness, and fine grain, as likewise its beautiful color, are qualifications which adapt it eminently for decorative art, and the perfection of the castings materially reduces the cost of subsequent chasing and finishing. The phosphor-bronze alloys made for railing, drawing, or embossing, will stretch more than copper, or any Of its ordinary compounds. Plates have been reduced by a single cold rolling to one fifth their thickness, the edges remaining perfectly sound and without crack. Another advantageous property of the new alloy resides in its incapacity to emit sparks. Tools, knivesr scissors, and other articles, sueh as locks, keys, etc., have on this account already been largely adopted by manufacturers of gunpowder. Several governments have experimented on the new alloy as to ita adaptability for making cannon. Without exception the result showe4