There was sooooo much interest in my little poser about My Grandfather’s Clock – on a quick count, zero.
Anyway, I know really you can’t wait any longer for the solution to ‘how long is the pendulum?’.
Period = tick – tock, ie 2 seconds
Formula is 2 x pi x Sqrt ( Length / acceleration due to gravity ) = 2
. . Length = Acceleration due to gravity / pi x pi = 9.8 / 9.87 = 1 m near as dammit.
And here’s the proof