Joseph Knight said that Joseph used the Urim and Thummim in a hat to translate the plates.
Joseph Knight Sr., Reminiscence, Circa 1835-1847, MS 3470, Church History Library
Now the way he translated was he put the urim and thummim into his hat and Darkned his Eyes then he would take a sentance and it would apper in Brite Roman Letters. Then he would tell the writer and he would write it. Then <that would go away> the next sentance would Come and so on. But if it was not Spelt rite it would not go away till it was rite, so we see it was marvelous. Thus was the hol [whole] translated.