Hmm There was a day, just a few years back, where the Russians published a bad ephemeris. If you were tracking Glonass that day - nothing worked - n...

?ÿ Only so long as the birds are flying and the batteries last. I'm thinking I might want a pure optical instrument and to practice my star and sola...

Those terms are really old - predates glass circle instruments - and probably goes back to the days of vernier instruments where the circle was physic...

@dave-lindell Thought it probably would be. Thanks for confirming.

Right and Left I'd say the sum of the vertical angle on both left and right faces was out of spec.

@brad-ott ?ÿ

I am more used to the Isograph stencils like this They are pretty quick when you get used to them. Could not find a video of one in action. All I c...

Well put - a genuine safety culture is really hard to engender. It comes from both directions - from the crew and from above.?ÿ It cant happen if ei...

"To err is human" -?ÿEvery surveyor makes mistakes The trick is to catch them before they become a problem

Penetrometer ?

@gordon-svedberg?ÿ I remembered seeing one like that when I was a kid. Thanks for reminding me where it was. We were only in DC for a few days, but...

There is a really cool example of Foucault's pendulum clock in the science museum in London. A simple no tech way to tell the time. I believe similar...

@mike-berry The guys manning the CSS Hunley must have been incredibly brave. The idea was to come up behind a ship, ram an explosive charge on a sti...

Because the Trimble beam is wide, it tends to pick up on the closest thing in the view with the strongest return signal, not necessarily exactly where...

@johnymal Think it might be a Trimble TDC100 being tested