JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. Fig. 1) south of the ,actual occultation zone and obtained negative results. The sky was of excellent photometric quality with scintillation noise below average and all equipment functioned properly. An attempt was also made by S. D. Sinvhal at the Uttar Pradesh Observatory in Naini Tal, India, with photoelectric equipment but the fluctuations in sky transparency were too large for any events to be detected.
American Association for the Advancement of ScienceThe photoelectric observations of the event from Lembang (107.6?E, 6.8?S, 1300 m above sea level) were made with the Bosscha twin 60-cm refracting telescopes mounted in ithe same tube. The sky was clear and of excellent photometric quality. Measurements were obtained with a two-channel photometer, one channel for the red [wavelength (X) ; 6000 A] and the other for the blue (Xk 4500 A), with cooled photomultipliers and pulse-counting electronics. Only the data from the red channel, which were of higher quality, are reported here. The accumulated counts (at a sampling rate of 22.25 sec-) were displayed on a visual readout and recorded with a 16-mm cine camera operated at a framing rate of about 24 sec-1. Also photographed was the display from an accurate quartz oscillator referenced before and after the event to radio station WWV by using an observatory chronometer. The absolute accuracy of the timing is estimated to be ? 1 second; the relative accuracy during the event was + 0.1 second. Dead-time corrections of approximately 25 percent have been applied to the data. Direct photographs of the event were also taken and have been published elsewhere (3). The photoelectric tracing obtained at Lembang is shown in Fig. 2
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.