Micrometric Measuremensts Made with the Equatorial Telescope of Fifteen Inches Aperture During the Years 1866-1881 Volume 13 baixar o livro de graça

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...fifth line after intense looking. 93. Moon at 71 Orionis. Nebulosity not well made out in spectrum of i Orionis. 94. J. W. saw light to 9.30 of the spectroscope scale a 6020, also some at 6.50 6740 . Both observers saw or suspected a line between the third and fourth. According to C. S. P., the new line was about as far to the right of the fourth as the first is from the third; the line suspected by J. W. was as much farther towards the third. 95. Fourth line brilliant. The continuous spectrum begins between 6.50 and 8.30 of the spectroscope scale 6740 and 6250 . To determine the relative extent of different parts of the nebula in which its spectrum shows four, three, two, or one of the observed lines, four transits were taken in the declination of the middle of the trapezium, with the following results; the last transit was considered the best. 96. The point at which the continuous spectrum seems to be best defined is s f the trapezium by a distance equal to the diagonal of the trapezium. The continuous spectrum is at least as bright as the spectrum of the nebula in Andromeda. When the slit is so narrow as to make the lines very fine and sharp, there is a black band in the continuous spectrum close to the fourth line, towards the third. 103. Nebulous place seen in belt of Orion, away from any bright star. 104. Star n p neb; Aa cos 8 175."53; A5 249."14. 105. A small star, s p DM. +21 907, almost exactly in the place of this nebula, does not appear nebulous, and no nebula is visible in the field. Belative position and distance of the two stars; p 267.24, s 37."06. 108. There are three stars of about the same magnitude and within the same degree of declination, but quite remote in R.A., which have a...