Since 2007, many diffraction gratings have been distributed worlwide, in more than 25 countries. Two models of diffraction gratings are circulating: one as a slide frame, the other one as an adhesive cap for mobile phone. To better visualize the distribution of them, each grating has been geolocalized from the zip code used for sending.
After a month spent going back and forth with a Professional 3D Printing Society, and some modifications in order to decipher as
Order your diffraction grating slide and go to the hunt of UFO’s spectrums. Several methods are available to get yours at low cost. The diffraction grating remains as free.
Fifty diffraction gratings are about to be delivered to Ukraine. A warm thank to the private groups from Eastern Europe who realized the importance of these free, easy to use small devices.
Sorry, this entry is only available in Français.
