text: Yes, Charles Davidson worked at Greenwich observatory. He was in charge of the eclipse observation that could proved Einstein's theories about the gravitational effect on light. Unfortunately for him, he couldn't make the observations because of the rain.\n\n\n---Addition---\nI could only find this link in Spanish:\nhttp://www.ciencia-hoy.retina.ar/hoy44/demo3.htm\nThe observation of the eclipse had to be done in Pass Quatro, Brazil.