So it makes me wonder. Could a manufacturer make an optical corner reflector with front-surface mirrors surrounding air? (Like the metal ones for radi...

That's not easy reading, but what I've waded through really opened my eyes to several complications. I'd guess that few other than NGS, John, and Kent...

I guess I got lucky in finding a wife, or else we're both getting mellow in our old age. Our fall trip of 11 days included just 2 days of organized a...

I don/ know about those cards, but small USB sticks don't seem to be going away from Ebay. I thought I was buying 8 Gbyte sticks and got 8 Mbyte ones!...

Do I understand correctly that the deed should read "subject to easement for county road right-of-way"? The "less" wording would prima facie retain, ...

Only a little bit. The offset to make it nodal depends proportionally on the size of the prism and also somewhat on the index of refraction of the gla...

What equipment??ÿ Does it require a digital level??ÿ Automatic levels are cheap as gear goes.

Iowa has free online access to deeds, plats, and corner records for all counties on one site. Earliest date may vary among counties, but seems to be l...

Ideally, you should be sighting at the target surrounding the prism so that pointing the prism isn't an issue for H or V angles. A cube corner prism ...

There are a variety of vernier scales used on transits. I am looking at an example I the Davis, Foote, and Kelly book of a 20-0-20 vernier that reads...

What matters is the leas count of the vernier, not the range of the vernier.?ÿ I thought transits were always named by least count. I missed that your...

Assuming proportional improvement in the marking of the scales, then yes. Whether that matters depends on whether you are doing 200 ft lots or very lo...