Science Volume 1

Science Volume 1

By (author) 

List price: US$19.99

Currently unavailable

Add to wishlist

AbeBooks may have this title (opens in new window).

Try AbeBooks

Description

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...planet by contrast of its disk and light with the appearance of an average star of about the thirteenth magnitude. In the actual search, a power of 600 was often employed, but most of the search was conducted with a power of 400 diameters. On thirty clear, moonless nights, between the 3d of November, 1877, and the 5th of March, 1878, this search was carried on after the manner I have indicated. After the first few nights I was surprised at the readiness with which my eye detected any variation from the average appearance of a star of a given faint magnitude: as a consequence whereof my observing book contains a large stock of memoranda of suspected objects. My general plan with these was to observe with a sufficient degree of accuracy all suspected objects. On the succeeding night of observation these objects were re-observed; and, at an interval of several weeks thereafter this observation was again verified. At 3 A. M., the 6th of March, 1878, the search was discontinued--my observing book ends with the following note: "The adopted plane of orbit of trans-neptunian planet is now searched (without break) from v-146. 8" to v--iib.i."" I have much confidence in this telescopic search--my aim was to sweep the zone so carefully that there should be no pressing need of duplicating it. I ought not to conclude this paper without adverting to the apparently long delay of its publication. From the very beginning I had approached the entire problem of search for a trans-neptunian planet with resolute direction toward the end which I regarded of the highest scientific import--that of finding the possible planet at the earliest moment; if I were successful, observations of its position would then be secured at once, and an accurate...show more

Product details

  • Paperback | 92 pages
  • 189 x 246 x 5mm | 181g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236496493
  • 9781236496492