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- From: doerfler@cbnewsf.cb.att.com (ronald.w.doerfler)
- Subject: Sundial Summary
- Message-ID: <1992Nov21.235919.7804@cbfsb.cb.att.com>
- Keywords: sundials
- Sender: news@cbfsb.cb.att.com
- Organization: AT&T
- Distribution: na
- Date: Sat, 21 Nov 1992 23:59:19 GMT
- Lines: 197
-
-
-
- I am posting this sundial article because I cannot get through
- on e-mail to Alan Paeth, who was interested in any response to my
- request for sundial magazine or organization information.
-
-
- Well, I've had no luck so far in my quest for any organizations or
- magazines for sundials. A couple of people have indicated their interest
- in sundials, but didn't have any leads. Since I see the term "dialists"
- in books and articles, I assumed that a fair group of people had an
- interest in this niche field, much like my other interest of stereo
- photography (there are magazines and organizations for this!). I
- haven't found anything yet.
-
- I have rounded up some articles and books myself, so I am listing
- a short bibliography of the better ones (they are in no particular
- order):
-
-
- SKY AND TELESCOPE magazine:
-
- July, 1972: "The Shape of the Analemma" by Bernard Oliver, pp. 20-22.
- An excellent article of the origins of the curve.
-
- June, 1960: "A New Universal Sundial Design" by Hermann Egger,
- pp. 470-471.
- Wavy hour lines take care of Equation of Time (Analemma)
- Correction.
-
- July, 1953: "About Sundials" by H. Egger, pp. ?
- Nice pictures.
-
- December, 1975: "A Design for an Analematic Standard-Time Sundial"
- by P. Kenneth Seidelmann, pp. 368-369.
- Large walk-about analemmatic sundials--people move a
- gnomon to correct location for the day of the year.
-
- January, 1982: "A Bit of Porcelain" by R. Newton Mayall, pp 16-17.
- Describes a nice-looking old sundial.
-
- July, 1982: "Gleanings for ATM's", monthly column, pp. 86-88.
- Describes a neat sundial full of analemmas.
-
- November, 1982: (same column as above?) pp. 486-487.
- Describes a sundial with an analemmatic-shaped gnomon.
-
- December, 1987: Astronomical Computing monthly column, pp. 646-648.
- Describes sundials on walls.
-
- July, 1964: "Making Portable Sundials" by R. Newton Mayall, pp. 9-12.
- Graphical instructions.
-
- November, 1966: "Results of Sundial Competition" by Hermann Egger,
- pp. 256-?.
- A few neat ones.
-
- October, 1968: "Sundial at Riverside" by Imre Kalincsak, pp. ??.
- Discusses one sundial.
-
- November, 1972: "A Hybrid Sundial" by Albert Ericson, p 299.
- Discusses one sundial.
-
-
- Amateur Scientist Column of Scientific American:
-
- December, 1980, p. 230. A neat "analemmic" sundial.
-
- May, 1966, pp. 128-136. Instructions for making a card dial.
-
- September, 1953, p. 160. Various Dials.
-
- October, 1954, p. ?. Sundials of some sort.
-
-
- The Amateur Scientist, Simon and Schuster, NY, 1960.
- (full name: The Scientific American Book of Projects for the Amateur
- Scientist):
-
- Chapter 8: "A Sundial that Keeps Clock Time"
- Curved gnomon to account for Analemma.
-
- Chapter 7: "A Universal Sundial"
- Very interesting chapter on using an aligned globe to
- calculate the time, declination, sunrise and sunset, etc.
-
-
-
- "The Astronomer's Odd Figure 8" by Kenneth L. Franklin, Natural History,
- October, 1962, pp. 8-15.
- Great graphics.
-
-
-
- Sundials: Their Theory and Construction, by Albert E. Waugh, Dover, NY,
- 1973. ABSOLUTELY the best book on sundials and instructions on calculating
- and making them. Available still in bookstores (and libraries).
-
-
- Sun-dials and Roses of Yesterday, by Alice Morse Earle, Charles Tuttle
- Publishing Co., 1971 (second printing 1984). Originally published in 1902,
- this is a curious book full of the history and romance of sundials--
- not for everyone, though there are many, many pictures of sundials,
- albeit poor quality black-and-white ones per the era.
-
-
- Sundials, by Christopher St. J. H. Daniel, Shire Publications Album 176,
- England, 1986 (reprinted 1990). A 32-page booklet on various sundials.
-
-
- Sundials on Walls, by above author, Maritime Monographs and Reports No. 28-
- 1978, National Maritime Museum, Greenwich, London SE10 9NF.
- A 25-page booklet describing various existing wall dials.
-
-
- In addition, R, Newton Mayall has a book on sundials that I concluded was
- inferior to Albert Waugh's book above. Portions of Mayall's book were
- printed in a series of old Scientific American articles sometime earlier
- this century.
-
-
-
- I received an e-mail note from a Bruce Gold in Utah that wondered
- if my interest in sundials was the same as his: the fact that a skimpy,
- surface knowledge of the field is insufficient, unlike many fields of
- interest. You have to have knowledge and a feel for orbital mechanics
- of the earth. I am reproducing my reply here:
-
-
- >Hi Bruce,
- >
- > You know, you're probably right about the reason for my
- >interest in sundials. My educational background is in physics and
- >mathematics and I'm sure that the mathematics required and the
- >orbital mechanics involved is the most interesting part. I also
- >like the ingenious designs people have come up with, and I'm
- >pleased to learn that a well-made, location-specific sundial with
- >due regard to the correction for the Equation of Time can actually
- >be highly accurate. I tell people that in the long run they are
- >more accurate by definition because atomic clocks and other official
- >timekeepers are adjusted occasionally with leap seconds to keep our
- >time in line with sun time.
- >
- > By the way, my understanding is that sundials are MUCH
- >simpler to accurately make than lunar dials. A sundial can be
- >used during the night when lit by the moon by subtracting something
- >like 48 minutes a night from the reading for each night since the last
- >new moon (when the moon lined up with the sun).
- >
- > I first became interested in sundials when I was on a beach
- >a couple of years ago on a small island in Lake Michigan. A kid
- >asked his dad if it was time to go to catch a boat back to the
- >mainland. The dad took a stick, stuck it upright in the ground in the
- >middle of a cross he drew in the sand, and looked at the shadow,
- >declaring the time. This was extremely curious to me, and I
- >started to look into these things. I was eventually shown to
- >be correct in my original gut feeling that what the dad did was
- >total nonsense.
- >
- > I look for sundials now when I go places and I like to check
- >them out. I usually find them appallingly misunderstood. I have found
- >them pointing other directions than North, I have seen equatorial dials
- >lying flat on their gimbals rather than tilted (at one place the staff
- >returned the dial to the horizontal position within 5 minutes of my
- >correcting it), and I see the types often sold in stores. Many of
- >these are off by hours and yet no one cares enough to find the reason--
- >no wonder the average person thinks sundials are so inaccurate (in
- >addition to the latitude and longitude dependencies in sundials).
- >
- > There is a Time Museum in Rockford where I lived that has
- >many authentic old sundials and clocks (the latter of which don't
- >seem near as interesting). Speaking of orbital knowledge, I bought
- >a kit there produced by the National Maritime Museum in Greenwich,
- >England and assembled an astrolabe. This is really neat, and I've
- >used it to sight on the sun and align the star map (on the rete) for
- >the date to find the apparent time of day, which I correct for standard
- >clock time. I intend to sight on particular stars with it too
- >whenever the November clouds and rain end around here. Columbus
- >had one on his 1492 voyage and consistently misread it because of his
- >confusion with the tropical southern sky.
- >
- > I'm settling on a design for a wall sundial for the outside of
- >my house. The house lies along the NW to SE line, so the calculations
- >involved make it interesting. Albert Waugh's book, Sundials: Their
- >Theory and Construction, is the absolute best book I've found on calculating
- >various types of sundials such as this. It's available in bookstores.
- >
- > Well, it's been nice monologue-ing. Maybe you could let me
- >know what sort of interesting sundial things you've run across.
- >
- >
- > Ron Doerfler
- > Naperville, Illinois
- >
-
- /Ron Doerfler
-
-