On 1 October 2011 23:38, Tom Van Baak <[email protected]> wrote: > but perhaps one of our UK members can tell us the exact mass > of a pre-decimal penny...
About 9.4 grammes. Quite by chance I have a bag of 12 from the mid 60's, shortly before we went decimal, and the weight varies by about 1% between coins, but on average comes out to 9.40 g. I understand that, perhaps counter-intuitively, adding a coin speeds up the clock, as it moves the centre of mass of the pendulum's weight just that little bit higher, hence shortening the pendulum. Peter (London, England) _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
