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. XV. How to describe Geometrically a Declining Dial for the Elevation of London.
The first way.
THIS Dial being (as I said) an Horizontal one to those in our Horizon 40 Degrees Eastward from the Meridian, Find (as we show'd you in the Geographical or 20 Section) what Elevation or Latitude they have, and describe Geometrically an Horizontal Dial on paper for the said Elevation. In the next place consider the difference between both Longitudes, to wit how many Hours the Sun comes sooner to their Meridian than yours, so that if he comes, suppose, 3 hours, 'twill follow, that the 3 a clock hour line is to be the true 12 a clock line of this Plane, because 'tis really so late with those People, when 'tis but Noon with you, and consequently that their 4 will be your 1 a clock, and their 2 your 11. and in the like manner you are to mark the rest, having nothing more to do but to draw on your fair Plane a Line Parallel to the Horizon, and to place on it at right An∣gles the true 3 a Clock Line, (that is to say the 12 a clock line ac∣cording to your now alteration or present figuring the Hour-Lines,) for you will have all the requisite Marks or Points, not only to draw the other Hour Lines, but also plainly to see, where the Substilar will fall, and how high the Cock it self is to be; for they are all to correspond with those in the said Ho∣rizontal
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or Paper draught. Now in case the difference of Lon∣gitude between these 2 Places happens to be a Fraction, as (sup∣pose) one hour and 10 minutes, then (if the Declination of your Plane be still Eastward as in the former example) 10 mi∣nutes past 1 must be markt in the Horizontal Draught with the Figure 12, as the Meridian Line, and 2 and 10 min. with Figure••. and so on all along; whereas if the Declination were Westward, then 11 and 10 minutes will be the said Meridian Line, 10 and 10 minutes your 1 a Clock Line, &c; for thus you must operate in all other Cases, that is to say, you must still allow by the new figures the difference of Longitude, that chances to be between you and them, to whom the Declining Plane is Ho∣rizontal. But because this manner of Dialling may seem to some troublesom and confus'd (especially when the said Diffe∣rence of Longitude happens to be a Fraction, and not even Hours) I shall here adjoin a second Geometrical Way.