At last I have discovered someone who remembers the ringing of the bell. A lady who was at the school in the 1940s saw the recent newspaper story and I was able to speak to her. Known at the time as Thelma Sibley (now Totczyk) she remembers the bell being rung at the beginning and end of the school day. Her sister Pearl asked that the bell be rung specially for her on her 14th birthday in 1948. Thelma told me that she can hear the sound of the bell in her ears now!
All that now remains of this little tale is for me to have a sign made to place on the wall directly below the bell. It's in hand.