EB in OH describes HP's stone and its use.
Ezra Booth, "Mormonism--Nos. VIII-IX," Ohio Star (Dec. 8, 1831): 1
Hiram Page, one of the eight witnesses, and also one of the "money diggers," found a smooth stone, upon which there appeared to be writing, which when transcribed upon paper, disappeared from the stone, and another impression appeared in its place. This when copied, vanished as the former had done, and so it continued alternately appearing and disappearing; in the meanwhile, he continued to write, until he had written over considerable paper.