Makes light speak like Biblical burning bush. Like the voice speaking to Moses from the burning bush as described in the Bible, Sergius P. Grace, Assistant Vice-President of the Bell Telephone Laboratories, makes speech and music issue from the burning electric arc in the center of the projector shown in the photograph. Alexander Graham Bell first experimented with the "talking flame" as early as 1875, using bright rays of sunlight as the base. Bell scientists are again working on the theory, hoping to make some practical use of it. Grace, at the left, is assisted by R.M. Pease, right, a member of the Bell technical staff. 12/30