I was reading an article on The Register about mains powered clocks in Europe losing time; the gist of the article is that the 50Hz frequency of the mains was drifting, causing clocks to be inaccurate.
It got me to wondering if there is any easy way of measuring the mains frequency and/or drift here. Basically, we bought a new electric (mains powered) clock for our bedroom which sometimes keeps very good time and sometimes becomes wildly inaccurate up to gaining 3 minutes/day.
Just wondering if there was a similar cause; and how to find out.
Not that I could do much about it anyway, I guess...