I was going through all my old photos on google and forgot about these. I was working on the foundations of the 2 new bridges, and whilst bridge A was being excavated for the new foundations some of the old ones where still intact. I don't know what these are, maybe someone else does, but it looks like the base of the swing bridge. Incidentally, they were under some other foundations as well. These were taken on the Wallasey side.
All the bridges were hydraulic swing bridges before the Bascule bridges replaced them around 1930.
There were/are also lock gates under many of the bridges.
There's a real danger that the left will drag Britain back to the 1970s, with secure well-paid jobs, ample housing, properly-funded NHS and social care, free tuition, student grants, final salary pensions, affordable rail fares and fabulous films and music. David Osland 2025
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn
Slightly off topic, but I came across evidence of a the locks on the Weaver navigation canal being operated by water turbines - Pelton wheels I was later told.
I've not bothered to look into it further than a quick Google, but seems to confirm this. How they worked is probably carefully documented somewhere. Has anyone taken teh trouble to dig it out?