1987JAVSO..16...29H

In 1932 John S. Hall, a graduate student at Yale, built a caesium-oxide photoelectric photometer giving an effective wavelength of about 8000 angstroms. With this he observed the Cepheid zeta Gem. Later Dr. A. L. Bennett used the same equipment to observe many variables. His light curves for only AO Cas, S Sge, and RT Aur were published. When Bennett was called for war work by the Navy he left behind observations on 30 long period variables and a few others of short period. As he did not return to astronomy after the war this wealth of observations has never been published.