Abstract
Oxygen lance method and big acetylene-oxygen blow-pipe method were treated. Both are the first trials in Japan, so the authors started their work with making special apparatuses and arrangements.
A four-ton steel ingot was the test piece to be cut by the former method. The size of steel pipe for the lance, gas (oxygen) pressure and consumption, time needed for cutting, etc. were studied. The report on the latter method is to be made later.
