Multiples of 100 metres has some disadvantages, especially if you are looking at older phase comparison instruments where a cyclic error might also be...
For most purposes just knowing that the prisms are all in reasonable agreement is adequate, but if there is possibility of an argument, you might as w...
Don't use two targets - use one only and read in each position in turn. That way you eliminate any inbuilt target error and have the instrument adjust...
The original GDM4400 units used to suffer badly from this; the later ones less so. Most modern machines don't seem to have too much problem. If they a...
The lower of the two Kern pieces is concave on the inside, to a slightly smaller radius than the upper convex plate. When they tighten the lower one s...
If I have to drill a hole I normally use a 6mm. countersunk head stainless steel machine stud. Once in it will never corrode - I've found them 30 year...
It seems the same on this side of the Pond.Quite a few new enquiries coming in, although not many yet turned into work. Many of the new developments w...
question rfc - railroadingI assist with a large 2mm (n) model - 80 foot circuit - and this is set up with full dcc. In the early days there were a lot...
RTK is useful as long as you understand that on occasions a point will be wrong for inexplicable reasons, even though everything suggests the reading ...
Refer back to the posts of 8th. December, asking if ISO 9001 was needed.So much of the work today (and in the past) needs proper documentation to reco...
Like John Hamilton I do a lot of monitoring type work, but ust a couple more examples of when you NEED to know just what the limits are on the instrum...
I've had similar experiences with deep drilled marks, going down 30 metres to bedrock. These consisted of extended reinforcement rods, inside a steel ...
Although we have staves which are dual graduated (so you can read two different figures on each pointing) we would always run out and back. For most m...
With invar staves you would expect a systematic creep unless two staves are used and observations carried out in the correct manner for precise levell...
I run a small business and we first registered under the predecessor to ISO9000 about 25 year ago. At the time UK government organisations were starti...
The expiration date should be the date on which the survey was completed. We always put the survey date (or dates if it was carried out in sections ov...
Compare camera costs : a photogrammetric camera costs several hundred times more than a conventional camera. Having said that then a good "consumer" c...
Sounds OK in theory - it's always good when the client supplies the vehicle.Two points to consider - firstly vibration which might be transmitted to t...
The Canadian rules are very similar to the UK CAA rules. Operating ceiling is 400 feet. The proximity limit is "150 metres of any congested area of a ...