A Cluster of Clocks

"What's that noise?" my two year old granddaughter asked the other day as she played in our bedroom.
"It's a clock," I replied.
In fact it's a travel alarm clock which my husband had at boarding school. We have recently ditched our radio clock alarm and brought the old wind-up clock out of retirement. Despite years of not being used it still works perfectly well and it has a medium sounding, quite fast tick which is probably why it tends to gain a little.

It's interesting how you can know s...