"Device USED in Training British Submarine Officers. 16 and 17 December 1942, Blythe, the Submarine Attack Teacher Is An Ingenious Device USED in the Training of British Submarine Officers. a Model of the Target Ship Can Be Made To Alter Course and Speed, While the Officer at the Periscope Below Gives His Orders As If He Was Carrying Out An Actual Attack. the Results of the Attack Are Later Analysed and Mistakes Pointed Out`." An RN officer at the periscope of the submarine attack teacher.