Chris James left Trinity in 1966 when his parents moved to Bagshot.  He has a memory of Mr Austin who taught physics.

One physics lesson by Mr. Austin was lecturing about radio activity.  We were told about alpha particles and gamma rays and given demonstrations with a Geiger counter showing the intensity of the radiation. He then went on to say that  "harmless” radio activity was used in fluorescent paint in clocks like his wristwatch but was very anemic.  He then put the Geiger counter to his watch, it went ballistic! Next lesson he had a strip of cardboard around between his wrist and watch, little did he know, lead would have been more appropriate, then that has it’s own problems.
The Tower Revisited  - The website for former Pupils of the Technical High School, Trinity High School & Trinity Grammar School, Northampton