A convenient way to mark the center of the sun's image made in a reflected ceiling dial is as follows. Punch a hole approximately 1 mm in diameter in the center of a 3" x 5" file card. Hold the card in the beam of reflected sunlight a few inches from the ceiling. Adjust the card perpendicular to
Sundialers,
A convenient way to mark the center of the sun's image made in a reflected ceiling dial is as follows. Punch a hole approximately 1 mm in diameter in the center of a 3" x 5" file card. Hold the card in the beam of reflected sunlight a few inches from the ceiling. Adjust the
@rrz.uni-koeln.de
Subject: RE: Marking Ceiling
Dials, Addenda
I
forgot to add a note and to sign my last message. Sorry for the
duplication.
Sundialers,
A convenient way to mark the center of the
sun's image made in a reflected ceiling dial is as follows. Punch a hole
approximately 1 mm
Re ceiling dials,
Lets get empirical:
I. Take a piece of ordinary looking glass and hold it by
its lateral edges, close to and beneath, your eye, and
look at some test grid (e.g. the day squares on a
calendar) across the room. Compare the appearance of
the squares' lines by low-incidence
Message -
From: Gordon Watson [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent: Tuesday, May 02, 2000 6:10 PM
Subject: Ceiling Dials
Greetings from Devon, England.
Anyone made a ceiling dial--a mirror by a window
projecting the sun's image onto the ceiling marked
with hour lines? I
Greetings from Devon, England.
Anyone made a ceiling dial--a mirror by a window
projecting the sun's image onto the ceiling marked
with hour lines? I have been considering making
one for years and am hoping to find information
on the net, but so far without success. Do you
know of any ceiling
PROTECTED]
- Original Message -
From: Gordon Watson [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent: 02 May 2000 17:10
Subject: Ceiling Dials
Greetings from Devon, England.
Anyone made a ceiling dial--a mirror by a window
projecting the sun's image onto the ceiling marked
seeing any articles on calculating ceiling
dials.
BTW, on the subject of ceiling dials, I have
invented a type which needs just one short
scale by virtue of using several mirrors to
'fold' the optical path. I am working on an
article for submission to the BSS Bulletin.
If anyone is interested, please
I am interested in making a ceiling dial -
a mirror on the window sill reflecting
the sun's image onto the ceiling.
Has anyone a) done this, or b) know where
I might get some designs.
Thanks,
Gordon Watson
Exeter, England
Gorden Watson wrote:
I am interested in making a ceiling dial -
a mirror on the window sill reflecting
the sun's image onto the ceiling.
Has anyone a) done this, or b) know where
I might get some designs.
There are instructions in Chapter 14 (pp 116- 121) of Waugh's book Sundials -
Their theory
Gordon,
The following appeared in the December 1995 issue of the Compendium - journal of
the North American Sundial Society. The relevant chapter from the book was also
reprinted in that issue of the Compendium:
Kalmbach Publishing Company (P.O. Box 1612, Waukesha WI 53187) has recently
Return-Path: [EMAIL PROTECTED]
Date: Fri, 24 May 96 17:23:18 GMT
From: Les Cowley [EMAIL PROTECTED]
Subject: RE: Ceiling dials
To: sundial@rrz.uni-koeln.de
Gorden Watson wrote:
I am interested in making a ceiling dial -
a mirror on the window sill reflecting
the sun's image onto the ceiling.
Has
Date: Fri, 24 May 1996 23:13:55
To: sundial@rrz.uni-koeln.de
From: Mario Arnaldi [EMAIL PROTECTED]
Subject: RE: Ceiling dials
I forgot another old Italian book speaking about it: OROLOGI RIFLESSI, by
Giuseppe Taliani, Macerata 1648.
bye
Mario Arnaldi
==
MARIO ARNALDI
13 matches
Mail list logo
