Description

Letter to M. Klein from Richard Walker, dated 1/21/1976; "The Beam Pattern of the Klein Model 400 Side Scan Sonar," by Richard Walker, 12/8/1975; "Transmit Beam Pattern Measurements on the Klein 500KHz Side-Scan Sonar," by A. W. Hart, Dec. 1985; Letter to Han Spek from M. Klein, dated 12/17/1986; Letter to Bill Key from Han Spek, dated 11/10/1986 with transducer test results; Oscilloscope display; Polar Co-ordinates