... chisel and hammer supplemented by a file. The polishing and sharpening are done in several stages: the first stage usually by rubbing the blade upon a block of sandstone; the second stage by the use of a hone of finer grain; and the highest polish is attained by rubbing with a leaf whose surface is hard and probably contains silicious particles. At the present time imported ... — The Pagan Tribes of Borneo • Charles Hose and William McDougall
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