GADDING MAMIE'S/M.—A quarry gadder is a machine by which holes are inserted into the side of the bench for the insertion of plugs and feathers, by means of which the blocks are separated in the quarry. Fig. 12 illustrates a gadding machine, designed by the writer of this paper, and made by the Ingersoll-Sergeant Drill Co. This ma chine is used for putting a series of holes on a true line in stone, for the insertion of plugs and feathers for breaking up the blocks. It is used in connection with the channel ing machine in what is called "lofting," or breaking from the floor of the quarry into the cut made behind, and for breaking the stone in sections by a series of horizontal holes cirl of bench. In marble quarries, where it is desired to separate the " stock," these holes are placed on the line of the " riving bed." or with the dip of the marble. The machine consists of the improved Ingersoll " Eclipse " rock drill, mounted upon and made to traverse longitu dinally a standard or post. which is fixed through trunnions at its lower end to a east-iron bed-pieee or ear, and which is made to swing in a vertical plane from a perpendicular position to a nearly horizontal one. The drill is pivoted to a saddle, which is raised or lowered on the standard by means of a chain, which passes over a pulley at the top and around a shaft, which is turned by a crank. The saddle is fixed at any desired point on the standard by means of a taper gib, which is tightened or loosened by the throwing up or down of a handle in the side of the saddle. The ear moves along the floor, without a track, and is fixed in position by means of corner pins. which are driven into the floor and set by set-screws. The machine will put in holes close to the bot tom of the quarry, in a horizontal position along the bench, into the roof, or perpendicularly into the floor, as desired, These varied po sitions are effected by swinging the drill on its pivot with the saddle, and by adjustmentof the standard. Where it is desired to use water in the holes during the drilling, a tank is placed on the bench, in a position about 6 ft. above the drill, and
through a small hose water is siphoned into a nozzled pipe, which is fixed to the shell, and which points to the hole, remaining in a fixed position, with the nozzle a few inches from the orifice. Where the bench is 6 ft. cr more in height, it is best to use a tie-rod or brace while putting in the top holes. This rod is attached to the upper part of the standard at one end, and is driven into the cut beyond the bench at the other, and will thus resist the thrust of the drill, The record of this machine in marble is 300 lineal ft. of 2-ft. hoses in a day of ten hours. It requires twenty seconds to remove from a 2-ft. hole and place the drill in position to begin another. The ma chine will put in a hole 3 ft. in depth without stopping.
The Diamond Gaddihg Machine is represented in Fig. 13. The machine is placed upon a platform on trucks ar ranged to run upon a track. When adjusted for work it may be braced by the pointed legs shown. The boring apparatus is attached by a swivel to a perpendicular guide bar. This guide-bar is secured to the boiler behind it, which forms the main support of the machine. Upon the guide-bar the boring apparatus may be raised or lowered at pleasure, for the purpose of boring a series of holes in a perpendicular line if desired. Upon the swivel the boring apparatus may be turned, so as to bore in any direction within the plane of the swivel-plate. The illustration shows the drill-rod or spindle placed near the base of the machine, and so as to bore horizontally. At one end of the spindle is the drill-head, armed with carbons, and supplied with small apertures or outlets for water. At the other end of the spindle is attached a hose for supplying water to the drill-head. A rapid revolving movement is communicated to the drill-spindle by the gears shown. The speed and feed movement may be regulated by the operator with reference to the hardness or softness, coarseness or fineness, of the material to be bored ; and the feed movement may be in stantly reversed at pleasure.