Re: Here it is
"The most important historical program of earthshine measurements was carried out by Danjon (1928, 1954) from a number of sites in France, but primarily from Provence. He used a `cat's-eye' photometer to produce a double image of the Moon, allowing the visual comparison of the intensities of two well-defined patches of the lunar surface - one in sunlight and the other in the earthshine - at various lunar phases. "