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GROUP XXI. 9 2. Putnam Machine Co., Fitchburg, Mass., U. S. machinists’ tools. Report.—Commended for a class of workmanship that has probably not been excelled; marvelous accuracy, amount and quality of materials used in the construction of the tools; elegance of design and harmony of proportions, affording the greatest strength for the amount of metal used; and for arrangement of parts, making them convenient and securing great economy in working; also for surface finish, which is one of the features of the machine-tool exhibition. The marked features of the planing machine are the angular feed in the head, by which any angle may be planed; the arrangement for raising and lowering the cross-beam and head by power; and the yielding shipping arrangement, by which the belt is made to move more rapidly from one pulley to another with regard to speed or the amount of labor done by the machine. The special features of the lathe deserving commendation are the simple and effective cross-feed; the eccentric nut on the feed-screw; the device for clamping tail spindle; the binder for securing the carriage when the cross-feed is in use; the reversing gears for right- and left-hand screw cutting; the friction overhead pulleys; and the generally remarkable accuracy. The slotting machine has an ingenious relief motion, by which the work is moved from the point of the cutting tool, preventing wear and injury on the return stroke; this is done without any joint in the cutting tool or in the sliding bar; thus the full strength of the cutting is not impaired; also a friction-stop by which the machine can be stopped at any point of the stroke. The bolt-cutting machine has an original arrangement of the head for holding the dies, so managed that the dies may be readily removed, and which admits of their being moved together as they wear, without hindering the operation of the machine; also for an oil- pumping device which gives three jets of oil to each revolution of the head. The vertical car-wheel borer is marked by splendid proportions and powerful con struction. It has a combination chuck with universal and independent jaws, and a double elliptical spindle, and a convenient hoisting crane; also a very convenient and effective feeding arrangement. The drilling machine has a combination of lever, worm, and power feed, and a counter balanced spindle which prevents the drill-spindle from dropping as the drill passes through the work. The table has a diameter of twenty-four inches, and is movable around the column, thus making its adjustment perfect at any desired point. The axle-lathe has a solid spindle bearing, with novel method of tightening when it becomes worn, lock-feed nut and new shifting device, and great strength combined with power and convenience. Collectively and in detail, the tools exhibited by this company show refinement in design; thorough and exhaustive calculation of the relative strength of the respective parts; a minute delicacy of accuracy which is the admiration of the most accomplished mechanics and engineers of the day; an ease, smoothness, and perfection of motion which will insure the reproduction of the finest work; and a general surface finish which has certainly never been surpassed and is not commonly known to have been equaled. 3. Brown & Sharp Manufacturing Co., Providence, R. I., U. S. MACHINE TOOLS FOR METAL. Report.—This firm have an exhibit numbering twenty-six machine tools for working metals. These tools are mostly designed for use in the manufacture of the smaller class of mechanism, and are characterized by great neatness of design and excellence of execution. The universal milling machine of this firm is especially noteworthy for the excellence of