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Apparatus for generating high press ures by applicat ion of force by an anvil against each face of a solid polyhedron is described. The equIpment constructed uti li zes a tet l ahedron of pyrophyllite and four tungsten carbide an viis as described earlier by H . T. H all. External force is applied to only one of the anvils, and wedge reac tion forces act on the other anvils, permitting the equipment to be used in a conventional hydraulic press. Examples of results of use of the equipment are given. Success of the design h as been shown by t he repeated generation of pressurcs in excess of 100,000 atmospheres indicat in g t hat large exist ing presses might be used to generate pressures of this order in volumes of sevcra l cubic in ches. For highcr prcssures a t wo-stage multi-anvil apparat us is proposed in which the second-stage a nvils are embedd ed in a large pyrophylli tc tet rahcdron to obtain ncccssary supporting forccs.

Compact multi-anvil wedge-type high pressure apparatus