ts of ex- A NEW SYSTEM OF SINKING SHAFTS. cellence in the design of this engine for the service shafts each 25 feet 6 inches in diameter are at present being bored by this machine at a colliery at Mansfield, in which it is to be engaged. The peculiarity of its FROM OCR ENGLISH CORRESPONDENT. A… … air drill, pre- rying the fire- A NEW SYSTEM OF SINKING SHAFTS. f e r a b 1 y two box out later- American the ingenious freezing process for boring on each arm. This plant is put together complete on ally over the rear pair of drivers. Its dimensions are: shafts through sandy soil. We illustrate…
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