Английская Википедия:Carefree sundial
Шаблон:Short description Шаблон:Cleanup bare URLs Шаблон:Infobox monument
The Carefree Sundial, in Carefree, Arizona, was designed by architect Joe Wong and solar engineer John I. Yellott (1908–1986),[1] was erected in the Sundial Circle plaza in 1959. The sundial is made from a steel frame and covered in anodized copper. As originally designed the 1200mm wide gnomon acted as a heat collecting plate for a local heating scheme. It measures Шаблон:Convert in diameter. The metal gnomon, the shadow-casting portion of the dial, stands Шаблон:Convert above the plaza and extends Шаблон:Convert.[2][3] Local apparent time is 27.7 minutes behind the meridian time which here is Mountain Standard Time. The hour markers are adjusted accordingly.
Description
The Carefree sundial was conceived and constructed by John Yellott of Phoenix, Arizona, the architect was Joe Wong. The dial's gnomon is Шаблон:Convert wide and Шаблон:Convert feet long, rising Шаблон:Convert above Solar Plaza. It is encircled by cacti and stones surrounding a reflecting pool with golden lines and concrete numbers to mark the time. Once it was visible from Шаблон:Convert but a shopping-centre has developed around it, obscuring the view. The hour-lines are offset to account for plaza's longitude, 6° 35' 36" west of the Mountain Standard Time meridian, 105° west. The gnomon served an ancillary purpose – designed to absorb solar energy which was converted into heat by three copper tubes, which pumped the heated water into a local heating system for a neighbouring office block. To facilitate the absorption the top Шаблон:Convert of the gnomon's length is coated with a special paint. A smaller 1/48 scale model is on site along with an equation of time table.[4]
Disputed claims
Various communities have made "the largest sundial in" claims. In 1913 the sundial in Ingleside Terraces, San Francisco was claimed to be the largest in the world,[5]Шаблон:Efn ignoring the existence of the dials at Jaipur. It had a dial diameter of Шаблон:Convert. There is even a larger one (Шаблон:Convert) at Hunters Point in San Francisco.[6] The Carefree claim is disputed by Sun City, Arizona, who have repaired their competing dial which is built from a Шаблон:Convert steel I-bar.[7][3]
Gallery
References
- Footnotes
- Notes
- ↑ bigwatse.com; see Passive Solar Journal, Vol. 4, No. 3, 1987 (John Yellott Memorial Issue) for Yellott's biography.
- ↑ Шаблон:Cite web
- ↑ 3,0 3,1 Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite news
- ↑ http://sfcitizen.com/blog/2009/07/07/the-giant-sundial-of-san-franciscos-hunters-point-ridge/
- ↑ Шаблон:Cite web
