The advantages of mounting powder specimens free of any binder, adhesives, fibers, or tubes have led several workers to suggest methods and devices for extruding a tiny cylinder of powder. In one of the most recent of these <i>(1),</i> the powder is packed into a 19-gauge stainless steel tube with a plunger made of No. 22 steel wire. A demountable assembly maintains the alignment of anvil, specimen tube, and plunger.

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