Police amplifier car at football game, Los Angeles, Calif., 1937

3 photographs of a police car with loudspeakers at the top corners of its windshield, 2 including a police officer, and one with a crowd of people crossing a road, Los Angeles, California, 1937 November 6. "Subject: Police amplifier car at football game; driver J. C. Wolmsley, announcer A. K. Trout." "Client: Ford Motor; Agency: McCann Erickson, Kein; Classifications: T. Autos; Operator's report - name: 'Dick' [Whittington]; 2 original photographs; in city; Amount: $5.00; Kein; [sold to] #2 - Radio Training Ass[ociatio]n 4/[19]47" - on envelope.