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Yes - thanks again. One of the problems is that here in the UK we don't get that much sunshine ! http://files.engineering.com/getfile.aspx?folder=0d18f1b5-bf48-4516-af4d-a8c342596d90&file=image1.PNG

Thanks for the comment. I have received a reply from the BGS. It is not good news... "The accuracy that we assign to magnetic field model values is rather difficult to assess. This is because the observed field is made up of signals from a number of sources, primarily from flow of molten...

Hi Folk... I am interested in surveying azimuths with a precision and accuracy of about 1 minute of arc. I have been finding true north using a sunshot technique (theodolite, clock, nautical almanac) and have been getting good reproducible results which have been satisfactory. But the...

Hi Bruce - Yes - your reply is most welcome. It would be a great help if you could send your notes. Here is my email address : aj-smith@blueyonder.co.uk.

Thank you Dik. I am hoping that I shall be able to correct it, but am reluctant to meddle with the instrument until I have a clear understanding of what I should do. I am amazed by the precision of this theodolite. I have previously used a Theo 120 for archaeo-astronomical investigations, for...

Here is a pic of what I see when the horizontal scale is selectedhttp://files.engineering.com/getfile.aspx?folder=a4d472b6-e228-4e49-bd97-1ea3361a074a&file=010h.jpg

Hi - I have just received delivery of a Zeiss Theo 010 Secundentheodolit. The instrument is in good order, but there seems to be an error in the adjustment of the vertical circle micrometer. The attached pic shows what I see when the vertical scale is selected. Is there anyone who has any...

Hi Folks - I am a professional electrical engineer, but as a student did a common 1st year with Civils, Mechanicals & Aeros, so feel that I should be understand some basic ideas in civ. eng. But this one has stumped me. I became interested in corbelling after crawling into the wonderfully...

Just for the record, these questions are now answered. I consulted Nicolas de Hilster, who seems to be exceptionally knowledgeable about all matters thoedolitical: http://www.dehilster.info/index.php "... the threaded nipple is where power comes into the instrument. It requires a special...

Thank you. If anyone is able to provide more specific info re any of these questions I would be most grateful.

adjuster pichttp://files.engineering.com/getfile.aspx?folder=f3108f11-0399-4cd2-882e-42f1ccf293d0&file=locked_adjuster.jpg

another...http://files.engineering.com/getfile.aspx?folder=8bbc3437-9266-4724-ac5b-96e0ea3d55a8&file=threaded_nipple.jpg

cant delete this !

Ok. Thank you for your reply. Here are my Queries. 1) When the bezel of the illumination window is rotated to a certain angle, what look like 2 sockets for electrical wander plugs are revealed. I am guessing that these relate to an alternative electrical illumination system. Is there an...

Hi Guys. I have just bought a Kern K1A theodolite. There are features on it I don't understand. Does anyone out there know about these theodolites ?