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Show U PERISCOPE HELPS SPOT SPEED BUGS 4 - ' i - -1 J i j j Hen a b sioel imp Erora which no speedster enn escape t's ii) Ls Angeles, inhere motoriata like 'o speed thrbugb the tunnels To Mop them, Sergeant Frank Harlan oi tin- motorcycle squad has, caught on the ideal: of detecting violators by tifte . periscope. He waits am! watches thruunh i his instni-ment, instni-ment, at one eml of tlie tunnel, and using a top-watchj sees lio long it takes a car tn pa-;s throUgB from the moment ii hits the siuulow at ihe otln r end to time ii abreast of him He knows the length I of the tunnel and therefore can calculate how fast he car is speeding II ir exceeds the limit, he motions to a policeman standing by; w ho sets off after the wpffoder |