Each of the School "roll photos" (and we have 9 of them, between 1938 and 1970) contain over 600 people. Former pupils have wanted to preserve the names of people on these photos, where possible. To aid in this process of identifying who is who, every person on each photo has been numbered. People wanting to identify a person's name do so by reporting the name and number on any roll photo.
This isn't an easy process. The idea of adding numbers in a row-wise fashion turned out to be complicated; many times, rows were very "wiggly", some rows stuttered and bent, and some rows just expired without continuing their expected course. A section of one of the photos illustrates this: