Robert Baird says that Joseph read off the translation to Martin Harris and Oliver Cowdery with a partition in the room.
Robert Baird, Religion in the United States of America: Or, An Account of the Origin, Progress, Relations to the State, and Present Condition of the Evangelical Churches in the United States, with Notices of Unevangelical Denominations (Glasgow: Blackie and Son, 1844), 647
. . . the plates having of course been found as described, the impostor set about the writing out of this revelation, and pretended, with the aid of a pair of stone spectacles found also in the box, to read it off to a man of the name of Harris, and afterwards to one called Cowdery, these acting as his amanuenses. The “ prophet,” as he is now called, took care, of course, that neither of them, nor any one else, should see the plates, the part of the room he occupied having been partitioned off from where they sat by a blanket.