So do I understand correctly that you were able to see the blue box from north side of London Bridge (when standing on the bridge) ?
I ask because I had a good look yesterday and couldn't see it from any easily accessible ground level point on the north side of the river between London Bridge and Southwark Bridge (I was trying to show it to someone when we were out on a run). I will have another look tonight at a more leisurely pace.
At the risk of turning this into something out of all proportion to my original question - I would be grateful for a clearer answer.
I'm sorry if I'm not expressing myself well enough for you, so let me try again - I'm asking you to explain exactly where you were standing on the north bank of the river to be able to see the Tabard development and the blue box. In particular, were you at ground level or on an upper floor in a building ? Were you standing on London Bridge itself ? For the development to be "behind Southwark Cathedral", it seems to me you would have to be closer to Southwark Bridge to have a line of sight. If you could just say clearly where you were, that would be very helpful.
There is a serious purpose to this question (well, serious-ish) rather than idle curiosity.
an ideal way of generating the electricity for the barometer would be a wind powered generator of some sort on the roof, just like the ones that will supposedly be built into the top of the E&C developement.
This could power the box, and also the 24/7 lights in stairwells, and also maybe some electricty in the flats. this would certainly reduce the overheads. I think all blocks of flats or offices should be forced to have some kind of renewable energy in place, solar panels or wind turbines (or maybe hydrometers inside downpipes), but that's probably for another thread..