Show T Traffic r Signals Controlled b by byS S Sound to Be Tried in Cleveland I CLEVELAND OhIo March 5 6 AP-A AP fire fire truck careening through a busy street an intersection tion feet ahead the red ed tra traffic lc light flashes to bar the way A shrill scream from the trucks truck's siren and the red light fades to green The truck rushes through Traffic is is resumed That Is what H. H F. F Witwer an ot of a battery company here here- proposes to demonstrate to Cleve- Cleve laud police officials lIe ile lisa has perfected per per- n. n device he says that conS cona con con- t S a troIs traffic sIgnals by sound and has alreadY exhibited a working I model to Edward J. J Donahue traffic traffic fic commissioner The contri ance anceIs Is to be attached to the traffic lights at a downtown intersection and a police car equipped with n a. special siren will try It out Witwer says sars the principle ot of his Invention Is simple being based on the air vibrations caused by a a. high high- pit hed sound The apparatus controlling con con- trolling the light Is attuned to a certain pitch h and would be unresponsive any other Bound |