Scale-bor′er.
An implement for removing the scale from boiler-tubes. Keener's (Fig. 4657) is arranged to be readily taken apart, so that it may be introduced through the man-hole. The bed-plate A is secured to the boiler-sheet by screw-clamps; the cutter-head H on the shaft G is rotated by bevelgears through the medium of the crank L, and is advanced by the lever I adjustably fulcrumed in the standard J. Extensions may be fitted to the shaft G, enabling it to bore through tubes of any length. |
| Scaler-borer. |
