Architects, builders, stonemasons? What's this symbol?
its a baseline isnt it? i.e. a level from which other things are measured?
Posted 6 years agovertigoMember
datum mark/level i think. it would normally (in modern timber/steel/concrete framed construction) have the level noted next to it but i’d imagine they just keep a record in stone construction rather than scribe the numbers into the stone.
stoner is correct, every trade uses the same established datum in order that all their respective works tie in at the required levels.Posted 6 years agosummittopplerMember
A little late but an Ordnance Bench Mark (OBM)
and don’t move them as you need planning permission first 😉Posted 6 years agocynic-alMember
I have been educated! Me too – I didn’t realised that they weren’t used anymore, although I guess it’s not surprising with advent of GPS. Also I’ve never understood what defines sea level, surely it’s dependent on the tide – which can vary a fair few feet.
Bless!Posted 6 years ago
Goodness me don simon, you making a prat of yourself on that other thread is still very much on your mind I see. Still I don’t blame you, it must have been really embarrassing for you.
And tell me, are you going to go crying to the mods now, ’cause I called a prat – like you did when I called you a dickhead ? 😀Posted 6 years ago
If you two girls could put your handbags down for a minute:Posted 6 years ago
See the thickness of that lead Stoner ? …..that represents about one year’s worth of sea level rise that does.
So next time a site agent pulls me up saying that the heads of me door linings are a mill or two adrift from the datum line, I’ll say “give it a year or two mate, and those heads will be spot bollock correct” (I normally like to work within the “half a gnat’s bollock” system of measurement)Posted 6 years ago
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