Dear Alex,
Thank you for your rapid reply...
As architect my comment on no.1. is that the north arrow which
we place in drawings (at least the ones I place) are based on
the North direction on large scale survey maps supplied by
planning authorities and on which the drawing would be based.
Dear Mr King,
Interesting post.
As architect my comment on no.1. is that the north arrow which we place
in drawings (at least the ones I place) are based on the North direction
on large scale survey maps supplied by planning authorities and on which
the drawing would be based.
Errors of 15
I have been enjoying the comments on estimating wall declination,
especially those which have the ring of experience about them.
I am prompted to offer the following Consumer Guide to the
methods I have used over the years (and two I haven't). I
am sure that many readers will be able to add to
Hello Carol: (c.c Sundial List)
I'm back home and this morning I'm looking at your
wall declination measurements. Unfortunately, I am not accustomed to using
the nail method you used and I hesitate to comment because I don't want to make
a mistake. I have heard of this method however. I am
Gianni Ferrari
44° 39' N 10° 55'
EMailto : [EMAIL PROTECTED]
- Original Message -
From:
John
Carmichael
To: carol arnold
Cc: Sundial List
Sent: Monday, November 29, 2004 2:55
PM
Subject: Wall Declination
Measurement
Hello Carol: (c.c Sundial List)
I'm back
I think the measurement of the wall declination with the nail method done
by Caroil is correct.
The azimuth of the sun is 29deg 44min 31sec west of south on the mentioned
place and time.
And thus the wall declination is:
29deg 44min 31sec - 28 deg 31min 23sec = 1 deg 13 min 8 sec west of
south
Gianna got in before me with the answer to your question.
I use a version of the "nail in a board" method myself. I like to take several measurements, preferably over a couple of hours, to improve the accuracy of the measurement. As well as the horizontal position, I also record the vertical
John Carmichael wrote:
Subject: Wall Declination Measurement
Hopefully, somebody from the sundial list will help us.
This is my own preferred method of determining wall declination but,
before originally adopting it, I needed to be sure that
a) the 'nail' was truly pependicular
I wrote a program that determines declination of a vertical wall using just a
watch and a carpenter's square. It gives very accurate results if performed
when the square's shadow is long. Be certain to follow directions closely,
and measure the edge of the shadow as described in the method.
Measurement
John Carmichael wrote:
Subject: Wall Declination Measurement
Hopefully, somebody from the sundial list will help us.
This is my own preferred method of determining wall declination but,
before originally adopting it, I needed to be sure that
a) the 'nail' was truly
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