I was taught this method at school (London, late 60s). Why on earth anyone would think that making it more complicated by chucking in this unnecessary LCD business is entirely beyond me. Now I'm thinking I should check that my kids haven't been polluted by this nonsense!
I was taught this method at school (London, late 60s). Why on earth anyone would think that making it more complicated by chucking in this unnecessary LCD business is entirely beyond me. Now I'm thinking I should check that my kids haven't been polluted by this nonsense!