I've just stumbled across your request for info on the AgA Unicom device 2- 2 years later!! If you are still interested I have a Unicom and Charger wh...

It may be too late for you but this instrument will only fit a Kern tilting-head tripod family (telescopic-leg tripod type 181B/ fixed-leg type 171A f...

Tripod Blues...For those lucky enough to have the Trimble SX-10 the plummet in the instrument has a camera which can photograph the ground station and...

OOPS!For <> read <>in the above text.

Tripod Blues......I agree with Squowse in that the tribrach should not be moved. That said however.....If the tripod has obviously significantly move...

Pictured above is a photo of the Cooke Troughton & Simms (York, England) precision levelling rod (graduated every 0.02 ft. & figured every 10...

Hi Dave,I have sent you an eMail (ingram@cfw.com) directly from my eMail address, let me know if you received it OK. "ship board star tracker". Does t...

Geodimeter 120Hi Jim,You're right of course about telescope mounted EDM's but many of the trunnion axes were of steel and as EDM's got smaller the loa...

I’ve checked up on the Bannister & Raymond Surveying on the Askania - as I know these details can be hard to find. The details also appear in the ...

Raise Your Hand If You Have Used A Subtense BarI have used the Subtense bar in anger. As well as using the bar in the conventional way I also used it ...

Lovely instruments Dave - the Kern is intriguing - looks like a one off!The Askania is also a fine instrument - There is some info on this in 1965 edi...

In defence of Kern centring....To my mind there is no competition between the Kern Auto-Centring system and what has become the defacto standard viz.,...