The English globe being a stabil and immobil one, performing what the ordinary globes do, and much more / invented and described by the Right Honorable, the Earl of Castlemaine ; and now publish't by Joseph Moxon ...
About this Item
Title
The English globe being a stabil and immobil one, performing what the ordinary globes do, and much more / invented and described by the Right Honorable, the Earl of Castlemaine ; and now publish't by Joseph Moxon ...
Author
Castlemaine, Roger Palmer, Earl of, 1634-1705.
Publication
London :: Printed for Joseph Moxon ...,
1679.
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Subject terms
Astronomy -- Early works to 1800.
Globes -- Early works to 1800.
Cite this Item
"The English globe being a stabil and immobil one, performing what the ordinary globes do, and much more / invented and described by the Right Honorable, the Earl of Castlemaine ; and now publish't by Joseph Moxon ..." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A31232.0001.001. University of Michigan Library Digital Collections. Accessed May 21, 2024.
Pages
OPERATION. XXIV. How to find the Degrees of the Reclination or Inclination of any Plane by the Globe.
THere are two ways to perform this Operation; for first (as I show'd you in taking the Level of a Plane,) the String rests just on the Horizon of the Globe, when it stands on an Horizontal Plane, or one 90 Degrees from being Erect and Vertical.
Draw therefore on the Reclining Face or side of the Plane (represented by Scheme 29.) a Line parallel to the Horizon (suppose AB) and let fall the Perpendicular CD, then place the Notches of the Pedestal of the Globe (mark't with SN) on the said Perpendicular, and consider what Degree in the Meri∣dian (counting from the Zenith) the String just lyes or rests upon, and that will be as well the Inclination, if the Plane in∣clines, as the Reclination if it reclines; for the Complement of this (I mean the distance between the Point, or Resting place of the String and the Horizon) showing always how much the Plane want's of being Level or Horizontal, the Degrees from the Zenith, must needs show how much it wants of being Erect or Vertical.
As for the second way, Draw a Perpendicular on the Recli∣ning side of your Plane▪ as I now show'd you, and placing on it (after the same manner) the Notches of the Pedestal, expect 'till the Shade of the Pin in the Zenith falls upon the Meridian of your Globe; for this show's the Sun to be at that moment in the Plane of the said Meridian; then observing on what Degree of it the Shade of Extuberancy falls, place but your Globe Level or Horizontal with your Meridian in the Plane of the Sun as be∣fore, and as the difference of these Degrees shows how much your Plane wants of being Horizontal, so that the Complement show's what it wants of being Erect, and consequently the value of it's Reclination if it reclines, or Inclination if it in∣clines.
[illustration]
Sch 29.
[illustration]
Sch 30
You may also if you please draw your Perpendicular on the Inclining side of your Plane (as in Scheme 30th) but then the requir'd Inclination, if it inclines, or Reclination if it reclines, will be the difference in Degrees between the aforesaid shades of Extuberancy, after you cast away 90; for by how much the Inclination happens to be, by so much the shade of Extube∣rancy exceed's 90, since 90 is the difference between an Hori∣zontal, and an Erect Plane.