kirner

plural kirners

1. ScotlandbusinessA hand-operated jumper.

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

   1902, Elementary Coal Mining, page 29

   2 more examples

   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.

   1887, Mining Institute of Scotland, Transactions - Volume 8, page 178

   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.

   1894, William Williamson, Mining Notes and Formulæ for Students Preparing for the, page 65