terça-feira, 5 de abril de 2016

Near SEA level - My favorites quotes from the famous Bowditch


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"The condition of the atmosphere has a considerable effect upon a light’s range. Lights are sometimes obscured by fog, haze, dust, smoke, or precipitation. On the other hand, refraction may cause a light to be seen farther than under ordinary circumstances. A light of low intensity will be easily obscured by
unfavorable conditions of the atmosphere.

 For this reason, the intensity of a light should always be considered when looking for it in thick weather. Haze and distance may reduce the apparent duration of a light’s flash. In some conditions of the atmosphere, white lights may have a reddish hue. In clear weather green lights may have a more whitish hue.

Lights placed at higher elevations are more frequently
obscured by clouds, mist, and fog than those near SEA level. In regions where ice conditions prevail, an unattended light’s lantern panes may become covered with ice or snow This may reduce the light’s luminous range and change the light’s observed color."

CHAPTER 5. SHORT RANGE AIDS TO NAVIGATION

BOWDITCH

THE AMERICAN PRACTICAL NAVIGATOR



Leia uma explicação para esta série de 30 posts clicando aqui


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