An exhaustive description of the visible spectrum of Beta Ori from the Balmer discontinuity to about 9000 A is reported. Equivalent widths and radial-velocity values for the most significant lines in the spectral range studied are presented. Moreover, an automatic data processing technique is described.

By 1980 there will be approximately 100 large optical telescopes in the world with mirror or lens diameters of one meter (39 inches) and larger. This atlas gives information on these telescopes and shows their locations on continent-sized maps. Observatory locations considered suitable for the construction of future large telescopes are also shown.

A simple standard criterion for computer measurement of the equivalent widths of digitized blended spectral lines and for drawing a local continuum as defined by Ardeberg (1975) is outlined. A procedure is developed with which the user need only select the spectral interval enclosing the line blend and the spectral features themselves determine the

SE DESCRIBE EL DISEÑO Y REALIZACION PRACTICA DE UN SISTEMA DE TRATAMIENTO DE DATOS PROCEDENTES DEL CIELO NOCTURNO. PARA LA TOMA DE DATOS SE HA MONTADO UN TELEFOTOMETRO MULTICANAL AUTOMATICO QUE PERMITE OBTENER MEDIDAS SIMULTANEAS EN DIFERENTES LONGITUDES DE ONDA Y BARRER DE UNA FORMA RAPIDA Y PREESTABLECIDA TRES ALMICANTARATS Y EL MERIDIANO DEL