When diluting or mixing powders with graphite using the Wig-L-Bug or the Flossy Amalgamator, a very complete mixing is obtained in a much shorter time with the use of a spiral coil of nichrome wire in a disposable gelatin capsule. It has the effect of 20 full-circle cutting edges with each single throw. The wire used is Nichrome Alloy V of 20 mils diam. The spiral coil, in the shape of a cocoon, has 10 complete turns in one in. of length. It is 5/16 in. o.d. at the center and tapers to an ⅛ in. o.d. at the flattened ends. This length causes it to be under slight compression when the disposable No. 000 gelatin capsule is closed, but not enough to have it trap any sample under the 2 points of contact at each end while oscillating. A convenient charge is about 200 mg. Graphite powder does not coat the wire.
William L. Dutton, "A Multiple-Cutting Accessory for Mixing Powders in a Capsule," Appl. Spectrosc. 15, 24-24 (1961)