Outside Circular Cutter

Stress-Strain Data. Tensile tests were made with an Instron tester at some seven crosshead speeds from 0.02 to 20 inches per minute at five or six temperatures from 30° to —46°C. The tests were made on rings cut with a special rotary cutter from the circular sheets of the elastomers. The dimensions of each ring were determined from the weights of the ring and the disc from its center, the thickness of the ring, accurately measured, and the density of the rubber. Typically, the outside and inside diameters were 1.45 and 1.25 inches, respectively, and the thickness was about 0.085 inch. The test procedure used is described elsewhere (11), and the cubic equation, eq 4 in ref. j 2, was used to compute the average strain in a ring from the crosshead displacement. 

Preparation of the cartridge. Make circular pieces of black powder pasted paper(pasted on one side only) with a wad cutter. The diameter is about the same as that of the inside diameter of the mortar. Take two of them and make a bag by pasting them together at the edges, placing the pasted black powder outside. Charge about 6 g of black powder grains in it and seal it with paste(Fig.127.(C)). 

A correct alternative to the one-dimensional cross-stream slice with parallel sides is a cutter (sampling tool) that rotates around an axis in a circular fashion. In such a case, the cutter must have a radial shape, that is, it must be wedge-shaped, with the cutter edges converging towards the axis of rotation (Fig. 4). This design ensures that material on the outside of the arc, where the cutter moves faster, has the same chance of being in the sample as material near the center, where the cutter moves more slowly. 

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