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weather vane
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| Photo Information |
Copyright: Costantino Topas (COSTANTINO)
![Gold Star Critiquer/Gold Note Writer [C: 1507 W: 4 N: 1494]](http://i1.trekearth.com/misc/g-n-g.gif) (9989) |
| Genre: Places |
| Medium: Color |
| Date Taken: 2007-10-18 |
| Exposure: f/2.8, 1/1000 seconds |
| More Photo Info: [view] |
| Photo Version: Original Version |
| Date Submitted: 2008-05-22 11:12 |
| Viewed: 373 |
| Points: 36 |
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| [Note Guidelines] Photographer's Note |
Weather vane at Samos island
A weather vane, also called a wind vane, is a movable device attached to an elevated object such as a roof for showing the direction of the wind. Very often these are in the shape of cockerels and are called weather cocks. Arrows are also popular, but a multitude of designs have been used.
The weather vane must be balanced so that half its weight is on either side of its axis, but also designed so that the momenta about the axis of the areas exposed to the wind are unequal. This unequal momentum causes the vane to rotate to minimize the force of the wind on its surface. The design of the vane causes the end with the smallest momentum to turn into the wind, pointing to the source of the wind. Because winds are named from their source direction, the pointer enables the viewer to name the wind easily. Most simple weather vanes have directional markers beneath the pointer, aligned with the geographic directions. The pointer must be able to move freely on its axis.
An installation by Paul Joffe, using a "jin-pole" of a weather vane atop the 200 foot steeple of celebration church in Kingston, New York.Weather cocks, especially those with fanciful shapes, do not always show the real direction of a very gentle wind. This is because the figures do not achieve the design balance required in a weather vane: an unequal surface area but balanced in weight.
To obtain an accurate reading, the weather vane must be located well above the ground and away from buildings, trees, and other objects which interfere with the true wind direction. Changing wind direction can be meaningful when coordinated with other apparent sky conditions, enabling the user to make simple short range forecasts.
Early weather vanes had very ornamental pointers, but modern wind vanes are usually simple arrows that dispense with the directionals because the instrument is connected to a remote reading station. Also modern wind vanes are mounted with an anemometer, a device that measures wind speed. Co-locating both instruments allows them to use the same axis (a vertical rod). Weather stations of variable quality may be purchased, and these include wind vanes along with several other instruments with dials that can be read comfortably inside a home or office. Combining a propeller for wind speed and a tail for wind direction on the same axis is an aerovane, for accurate, precise measurements from a single instrument.iT can also be used for watching wind speed
Another wind direction device is the windsock used at airports to show wind direction and strength. The wind fills the sock and makes it blow away from the prevailing wind. Strong winds make the sock point almost horizontally, while light airs allow the sock to hang limply. Because of its size, the windsock can often be seen from the air as well as the ground. Even the most technologically-advanced airports still use windsocks.
According to the Guinness World Records, the world's largest weather vane is located in Jerez, Spain. A challenger for the title of world's largest weather vane is located in Whitehorse, Yukon. The weather vane is a retired Douglas DC-3 atop a swiveling support. Located beside Whitehorse International Airport, the weather vane is used mainly by pilots to determine wind direction. The weather vane only requires a 5 km/hour wind to rotate.
The term "weathervane" is also a slang word for a politician who has frequent changes of opinion. The National Assembly of Quebec has banned use of this slang term as a slur after its use by members of the legislature.
The word 'vane' comes from the Anglo-Saxon word 'fane' meaning 'flag'.Originally the people used flags to show the direction of the wind
from wikipedia |
dip, ribeiroantonio, paololg, chrkont, lucasgalodoido, siamesa, cfreire, belido, Docarmo, Jardim has marked this note useful
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- dip
(8649)
- [2008-05-22 11:20]
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Geia sou Costantine,
mia omorfi fotografia me yperoxa xromata kai fotismo.
Very simple picture but yet nice with a good compo and nice colours.
Antonio
Veramente bella, caro Costantino. Questa immagine ha una profondità eccezionale, con il blu de l mare che contrasta piacevolmente con il blu del cielo. Mi piace per come hai costruito la composizione, mettendo in primo piano l'elica per la direzione del vento. Ottimo lavoro, complimenti.
Ciao
Paolo.
PS: perchè hai tolto la tua fotografia dall'intro?
Γεια σου Κωνσταντίνε
Απλή και όμορφη η φωτογραφία σου. Γλυκά απαλά χρώματα σε μια κομψή σύνθεση που συμπληρώνονται από ένα υπέρ πλήρες σχετικό σημείωμα.
Ευχαριστούμε για την παρουσίαση
Χρήστος
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- crckt
![Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1394 W: 68 N: 1300]](http://i1.trekearth.com/misc/g-g-g.gif)
(6749) - [2008-05-22 14:17]
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Hi Costantino,
Good minimalistic shot, nice and simple. The vast body of water looks really beautiful.
Well done,
Shaeri
Ciao Costantino,
calma piatta nell'isola di Samos: non si muove una foglia e infatti non si vedono vele all'orizzonte.
Bella composizione, con pochi elementi ottimamente gestiti.
Buona notte
Ludo
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- Vames
(2719)
- [2008-05-22 15:15]
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γεια σου Κωσταντίνο,ιδανικό σημείο λήψης με ωραία θ'εα !
Hi Costantino,
interesting this prototype of fan, but I´d like of the scene in bacground. Good sharpness in image too. Great work my friend.
Congratulations and Hug!
HiCostantino,
A very beautiful picture. Excellent compo and fantastic colour of water and sky. the vastness of sea is amazing.
Regards
Maria
Hi Costantino
Good composition! Very nice colors and lights!
Best regards
Mehmet Emin
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- TopGeo
(11569)
- [2008-05-23 4:15]
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Geia soy Kosta!
Mallon Borios Borioanatolikos fisa! ektos kai an ine apnia kai to organo den to dichnei!
kali i idea sou(?)
Georgios
Hi Constantino
An beautiful minimalistic capture with good definition, colors and contrasts. The sea in background brought out the main subject. The lights are warm and nice. Good job. Regards, Consuelo
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- Nicou
(24059)
- [2008-05-23 7:28]
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Hello,
mangigique cliché, , ja'ime bien l'ange que fait la barrière avec le belu divin sur la mer superbe.
Bravo et amitiés
Nicou
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- belido
(8863)
- [2008-05-24 5:01]
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Hi Constantino,
there is a nice solitude atmosphere in this shot. I really like this feeling. I like to see the textures on the water and the wind vane as the element to contrast that background. Beautiful work!
Best wishes from Brazil,
Carlos
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- ifanik
(13914)
- [2008-05-25 1:39]
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Poly omorfi minimal photo me yperoxa xrwmata kai kadro
Moy aresei o tropos poy exeis topothetisei to kagkelo sto kadro
Xairetw
Nikos
Hi Costantino,
Very nice and effective picture. Amazing DOF! I like the colours too.
Excellent note, thanks for that.
MCV
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- Jardim
(1807)
- [2008-05-26 12:42]
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Olá Constantino,
the simple way as you compose the photo takes our eyes to focus on the main subject of the photo. Well done
Júlio Jardim
Hola Costantino,
Simple but a wonderful picture like the composition and the different blue colors.
well done
joRge
