Side-lights on astronomy and kindred fields of popular science; essays and addresses (1906)
Newcomb, Simon, 1835-1909 · New York Harper · leaf 112
ady, the image, whenthe eye-piece is pushed in, will be formed of a greatnumber of minute rings of light. If the glass is good,these rings will be round, unbroken, and equallybright. We present several figures showing how thesespectral images, as they are sometimes called, willappear; first, when… … SPECTRAL IMAGES OF STARS ; THE UPPER LINE SHOWING HOWTHEY APPEAR WITH THE EYE-PIECE PUSHED IN| THE LOWERWITH THE EYE-PIECE DRAWN OUT A. The telescope is all right. B. Spherical aberration shown by the light and dark centre. C. The objective is not spherical, but elliptical. O. The glass not…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
