measuring blueness

Delving into Blue(ts)

Today I have been reading about cyanometry and the cyanometer.

CYANOMETRY: The study and measurement of the blueness of light; the measurement of intensity of blue light, especially of the blue of the sky.

The cyanometer is attributed to Horace-Bénédict de Saussure (1740–99), a Swiss physicist and geologist, famous for his studies of the geology, meteorology, and botany of the mountainous regions of Europe, particularly the Alps.

The cyanometer had 53 sections, ranging from white to varying shades of blue (dyed with Prussian blue) and then to black, arranged in a circle. The color circle can be compared to any area of sky.The original instructions specified that the observer face to the north. de Saussure himself used the device to measure the color of the sky at Geneva, Chamonix and Mont Blanc. He concluded, correctly, that the color of the sky was dependent on the amount of suspended particles in the atmosphere.

ps:

4 thoughts on “measuring blueness

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s