ch is operated simultaneous - machinery, and the numerous difficult problems in connection then forged into shape by immense steam hammers. We ly with the raising of the chisel from the mortise. This be- therewith have been solved only by actual experiment. Of have frequently spoken of the large… … cally reciprocated chisel has obtained a preference. Other systems, such as rotating tools of various designs, are in use for special purposes where the same results could not be produced, or the stuff be conveniently handled, with the re- ciprocating mortising machine. The class of work for which…
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