Martin,Actually, the modern hand-held laser-rangerfinder can already be setup to be used as a total station either with or without relying on the magn...

What's an ARK2The ARK2 is a militarized / ruggedized north-seeking gyroscopic unit, meant to facilitate hasty-setups of artillery emplacements and est...

As listed in the Ebay auction, the ARK2 (and possibly the GAK1/ GAK2) also needed the following for operation:WILD GKK3 ConverterWILD GKB2 BatteryWILD...

John,The US Forestry service had a few of these- one of which made it into my collection of instruments- others which have shown up on Ebay occasion...

This just in from JurgDescription of the numbered items in the picture of the T-3R, above:1.- connecting block/ electrical relay 2. 15 Watt lamp (12 V...

Mr. Jürg Dedual gratefully has responded with his take on these "tubes"- below is a summary... the correct answer seems that these were installed as ...

Thanks for the extra pictures- very helpful.Also, in the pictures of the Dutch/ Jürg's T-3R, each with at additional "Light" on top of the standard wi...

Stephen-I've been discussing your T-3 with Dave Ingram, we've arrived at a couple of different opinions -One thought is that that the military (Army o...

Jürg Dedual will represent the final authority for this, but I believe the earlier posts regarding use of this modified T-3 have some merit, but also ...

There's one of these on Ebay, at WIld EDM mount on EbayI've also got one of these that I can sell, if you're not able to source them from Ebay or the ...

J. Penry-This appears to be an early 1800's "Repetition Circle", with a vertical arc for determining small vertical angles. A similar instrument appe...

More info on Pilot-Balloon (PIBAL) weather theodolitesAlso, continuing my comments; the use of dual-theodolites for balloon observations was not stand...

More info on Pilot-Balloon (PIBAL) weather theodolitesJim,Kent and Dave have the basics correct- I'm an ex- Air Force weather officer, so I have first...

The bubble on the side is misleading- that's actually where the centering bubble is stored- it's removed from the side holder and inserted in the midd...

I didn't see a direct email for you, but are you willing to consider selling a couple of these? I'm interested in the Wild T-3 model- or even the 3...