Dear John,
Nobody disputes your statement, but I think we are on different
frequencies. The orthonet is a useful tool for adding geological
features in their accurate spatial orientations to a block diagram at
any perspective selected. It still requires all the 3-D skills you
demand from a structural geologist, and it is done by hand, using
pencil and onionskin. Just like the stereonet, which it superficially
resembles (and which nobody disputes). The technique is rather old and
goes back to at least the 30 or 40s. I once had borrowed a little
stand-alone booklet about it, but cannot remember who the author was.
The orthonet is used in structure labs at some Canadian universities
for schooling the students' 3-D perception.
Jurgen Kraus
On 24-May-08, at 1:31 PM, John F. Dewey wrote:
>> John Ramsay is right. If one cannot draw any 3-D diagram, one
>> should not be in structural geology, which is a graphic subject
>> that demands a 3-D sense and an ability to draw.
>
> John Dewey
>
>> Surely any real structural geologist does not need a pre-cooked
>> package to compile a 3-D diagram? John Ramsay
>>
>>
>>> Message du 22/05/08 19:20
>>> De : "Jurgen Kraus" <[log in to unmask]>
>>> A : [log in to unmask]
>>> Copie à :
>>> Objet : Orthonet
>>>
>>> Excuse multiple postings!
>>>
>>> Dear all,
>>>
>>> I was wondering whether one of you has a scanned copy of the ?
>>> orthonet?, used to construct block diagrams (or a reference where
>>> to find one). Could not find anything on the
>> internet.
>>>
>>> Thanks,
>>> Jurgen Kraus
>>>
>>>
>>> Sunwing Energy LTD
>>> 101-6th Ave SW
>>> Calgary AB
>>> CANADA T2P 3P4
>>>
>>>
>>
>>
>>
>>
>> --------------
>
>
> --
>
> -----------------------------------
> John F. Dewey FRS, UC Distinguished Emeritus Professor of Geology
> Department of Geology
> UC Davis
> One Shields Avenue
> Davis CA 95616
>
> Telephone Nos:
> 530 752 5829 (UC Davis)
> 011 44 (0)1865 735525 (home)
> 011 44 (0)1865 276792 (University College)
> 530 752 0915 (Fax: )
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