Multiple-exposure 방법에 의한 사진관측과 그 처리법

Photographic Observation and Reduction Technique by a Multiple-exposure Procedure

A new technique of photographic observations is developed for the determination of time of minimum light of eclipsing binary. An instrumental system to accomplish the observation is described. With this instrument the atmospheric extinction coefficients in Seoul are observed, and four times of minimum light for Algol and W UMa are determined.