We are gathering archival observations to determine the photometric history of the unique and unexplained eclipses of the pre–main-sequence star KH 15D. Here we present a light curve from 1967–1982, based on photographic plates from Asiago Observatory. During this time, the system alternated periodically between bright and faint states, as observed today. However, the bright state was 0.9 mag b...

a method is described whereby the isodose curves of a cobalt unit were measured, using a simple photographic technique. the method reduces the effects of experimental errors and artifacts by cross_plotting the constants of decrement liner. the method is self-calibrating, and affords a useful allernative to the more usual water phantom pro:edures, in cases when this apparatus is not available

This particular edition is edited by Dr. Maurice Scanlon of Cardiff, a well-known figure in the field, and provides a reasonably comprehensive update of recent progress in neuroendocrinology. Among the chapter topics are the investigation of hypothalmic pituitary disease, current approaches to radiology of the region and medical and surgical management of pituitary adenomas. There is also a cha...

The capacity of automatically modeling photographic composition is valuable for many real-world machine vision applications such as digital photography, image retrieval, image understanding, and image aesthetics assessment. The triangle technique is among those indispensable composition methods on which professional photographers often rely. This paper proposes a system that can identify promin...

It appeared incomplete but formed a considerable segment of a circle. The above description applies chiefly to -the left iris. The departure from the normal. was less marked in the right eye. The writer believes this to be a case of congenital miosis of varying degree in the two eyes, and due probably, having regard to the findings of Holth and Berner, to developmental faults in the dilator mus...

In 1939, one hundred years after photography had been disclosed to the world, the thicket of received ideas about the medium's invention was so dense that even such an astute observer as Paul Valery could not extricate his thoughts from the tangle. For years the French poet and critic had been recording his unique perceptions of science, history, and contemporary culture. His commentary-filled ...