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Carefree sundial
The Carefree Sundial, in Carefree, Arizona, was designed by architect Joe Wong and solar engineer John I. Yellott (1908-1986),〔(bigwatse.com ); see Passive Solar Journal, Vol. 4, No. 3, 1987 (John Yellott Memorial Issue) for Yellott's biography.〕 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 in diameter. The metal gnomon, the shadow-casting portion of the dial, stands above the plaza and extends .〔(N. America Sundials Society )〕〔 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 wide and feet long, rising above Solar Plaza. It is encircled by cacti and stones surrounding a reflecting pool with golden lines and concrete Roman numerals to mark the time. Once it was visible from 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 in to 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 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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