On 2007-02-07 18:27:45 +0000, Owain said:

Mary Fisher wrote:
My daughters MADE tools at school (in the 70s)

I wanted to make an oscilloscope but the pocket money wouldn't stretch
much beyond a fridge alarm and an intercom system.

Owain

I made one from an old radar set. Worked quite well. I also found
out what HT supplies were.