1917 Plate Sleeve (IMAGE) Carnegie Institution for Science Caption Handwritten notes on the sleeve of the astronomical plate, made by observer Walter Adams, former Director of Mount Wilson Observatory. Credit The Carnegie Institution for Science Usage Restrictions With credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.