South Queensferry again

Back to South Queensferry to pre-run a course for the urban orienteering event I'm planning in June. Afterwards I went down to the waters edge and just my luck the tide was out so I could find a geocache that can only be found when the tide is out.

A friend told me some interesting facts about the Queensferry bridges:
1) It is the only place with bridges built in three different centuries
2) The miles of cabling used on the bridge is almost the same distance as the circumference of the earth at the equator.
I then looked up more facts here