John Storrs said that Joseph translated the Book of Mormon by using a "peculiar stone."
John Storrs, Letter to the Editor, April 8, 1839, in Boston Recorder, April 19, 1839, 1
And here perhaps it should be said, that the leaders of the delusion, pretend that the book was dug out of the ground, where it had been deposited for many centuries; that it was written on certain metallic plates, in a peculiar character hieroglyphic; that the finder, a man of money-digging memory who was accustomed to look into the ground by the aid of a peculiar stone, was in a similar manner enabled to read and translate it! Hence what is sometimes called the Mormon Bible.