Cyanometer Postcard
A cyanometer is a tool that lets you grade the blueness of your sky, invented in 1789 by Horace Bénédict de Saussure.
This genius modern version is combined with a postcard! Simply hold up to the sky, look through the hole and then on the back write the time & shade number. Pop in the post to a friend. 148x105mmÂ
Simple brilliance by Macarena Ruiz-Tagle.
Original: $5.00
-65%$5.00
$1.75Product Information
Product Information
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Shipping & Returns
Description
A cyanometer is a tool that lets you grade the blueness of your sky, invented in 1789 by Horace Bénédict de Saussure.
This genius modern version is combined with a postcard! Simply hold up to the sky, look through the hole and then on the back write the time & shade number. Pop in the post to a friend. 148x105mmÂ
Simple brilliance by Macarena Ruiz-Tagle.
