The key feature of the Bilby tower was that it was two concentric tripods, with the instrument mounted on the inner one while the crew moved around on...

Shooting from the hip without proper study of your pictures. Four screws near the eyepiece end could be holding the frame of the reticle (cross hair...

I don't know if there are still any PE licensees active who this applied to, but there were PEs who were grandfathered in as allowed to do boundary su...

I'd probably pay for shipping the best Topcon of the bunch if it is likely to work. What is included?

By notarization do they mean the suveyor's seal and signature? That should have been current at that time but logically there should be no requirement...

Lat-lon is neither metric nor imperial.<div> NGS does all dustances in metric. They provide conversions to feet as a convenience to users who ar...

I have used the Trimble 4000sse or ssi and corrected the date either by text editor (watch the spacing!) or by telling TEQC with the correct -week ###...

>"Since a survey must be recorded and it must be reviewed before being recorded" It is possible, to the chagrin of the county employees, for a stat...

I don't pay much attention to predictions of northern lights any more because in the 1990's I saw the show of a lifetime. In eastern Iowa about 42.15 ...

More exactly, the number is 34.4 mm = 0.113 ft, not 0.1 ft. If you use a non Leica prism and tell the instrument it is a similar Leica, the difference...

I saw it listed on the Society of Land Surveyors of Iowa web site for $100. Not sure it is currently available, but you need to try there if you haven...

I'm late to this party, but I'll offer this little writeup that I did a while back, trying to understand prisms.