Aiming their new warlike instrument at the sun from the Harvard station in Climax, Colorado, Donald H. Menzel, Prof. of Astrophysics and his assistant Walter Roberts, a graduate student in Astronomy, are shown above. This new station is the most recent addition to the ever expanding horizons of Dr. Shapley's world famous observatory on Garden St., here in Cambridge. The instrument embodies the most recent developments in optics including the new "invisible glass" coating which was developed by Dr. C. H. Cartwright at M. I. T. It will study the mysterious solar corona and prominences, upheavals of which occasionally cause radio storms of serious nature such as the one lact Easter. This is one of the very few instances where astronomical bodies have direct influence on the affairs of men.

Professor Menzel will give a free public lecture tonight about this instrument and the work done with it this summer. The title of his talk, which is one of a series of regular "Open Night" lectures at the Observatory, will be "Mystery of the Solar Corona."

Observations through the Harvard telescopes, which are made available to the Open Night audiences, will be particularly interesting this week and next, since the planets Jupiter and Saturn, and also the Moon, are in good position for observing, the Harvard astronomers pointed out.

The concluding lectures in the fall "Open Night" series at the Observatory will be: Nov. 6, "In Between the Stars," by Bart J. Bok, associate professor of Astronomy; and Nov. 8, "Peculiar Variable Stars," by Luigi Jacchia, research associate in Astronomy. The lectures are at 7:30 o'clock, followed by observing, if weather permits.

Admission to the Open Nights is free of charge, but free tickets should be obtained in advance by sending a self-addressed stamped envelope to "Open Nights," Harvard Observatory, Cambridge, stating the night and number of tickets desired.