slots and depress the platforms attheir iiiner edges, so that the load will be centrally dumpedthrough an opening along the entire length of the platform. An improvement in stamp mills has been patented by Mr,Frederick L. Preston, of Walworth County, Wis. The im-provements relate to mills for… … are two concentric metal walls, C, resting in a circulartrough, F, for receiving the non-congealable liquid, and inthe center of the space between the plates, C. there are ver-tical pipes, V, in which the liquidammonia is expanded intogas. Above these pipes, and in communication with theupper…
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