The first GDM4400 had poles with pin stops - due to the weight of the first RPU heads you couldn't rely on the usual twist lock to hold solid. The sa...

Correct. But the same would apply if you were marking out points (say hangers for pipework) - a marker pen attached to the point of rod, keep rod down...

2 person only in respect of having one on the target and one on the instrument. Surveyor on rod can usually put the point just where it needs to be - ...

Before somebody comments on my last post and says just hold the prism to the ceiling, holding the rod upside down means that the prism is near ht. of ...

Or you can use a prism pole upside down with a bubble attached next to the prism - once you get used to the fact that the bubble moves "in reverse".

Oh no! All that tells you is the "as-laid" situation. Trench was then backfilled and construction traffic probably ran over it. In any case, as othe...

Even if it wasn't just for earthworks it would still be good enough. Just screw the antenna on gently until it stops - it is always going to be within...

I always do that on construction work drawings - with a note giving my details. It avoids the situation when some newby sets up on a point and decides...

@party-chef?ÿ Only if the mould is on the outside of the plumb lens - I'd assumed tazsurveyor had already worked that out and the problem was that mo...

@tazsurveyor?ÿ Intresting thought - it might work, let's see if somebody posts to say they have tried one. BUT, it still won't remove the dead detri...

@tazsurveyor Wait and see, one might get posted.

If you search under mould you'll find the eyepiece!! Sorry! ?ÿ I've had it happen a couple of times and leaving the tribrach indoors in a warm room...

Interesting follow up to my post above. This morning I was clearing through some old storage boxes in our store when I came across a set of notes and...

At that sort of distance the result is going to be affected by the spread of the beam - you could get a significantly different "average" distance dep...

So they can Perch on shelves? Sorry, just my sense of humour (humor, for those who can't spell using the King's English) Actually it is surprising h...

Meters are what you put money in! UK uses metres (and DMS) unless very old documents in chains and rods.