New Method of Forming Powder Striations

Abstract

I NOTICED, while experimenting with a vibrating Chladni plate, that striations had made their appearance on some sand which had inadvertently been spilled on the bench below. The plate, at the time, was supported horizontally on some rubber studs which left an air space of only a few millimetres between it and the bench. That the striations were not caused by vibrations of the latter was easily proved by supporting the plate independently from above, and then producing the striations on a second stationary plate, or drawing board, which rested on a ‘Sorbo’ mat.