Kirner

It may be noted here that all the holes were bored with an ordinary boring ratchet, and although the hole is larger than the one prepared for powder, yet it was not considered that any extra labour was taken in the boring owing to the boring ratchet being used instead of the ordinary jumper or kirner.

Tools for Single Hand Boring -- Hammer, weighing 3 or 4 lbs. ; jumpers, made of 1 inch or 3/4 inch octagon steel, or iron tipped with steel — length, 2 feet, 3 feet, and 4 feet; face of jumper 1 1/2 inch, 1 1/4 inch, and 1 inch; kirners of same material, and about 4 feet long; cleaners of copper, 4 feet long.

The kirner was made to give repeated blows in the hole, turning it partly at each blow to keep the hole cylindrical.