Wikipedia

File:Stirrup method (1652)-(1).svg

Original file (SVG file, nominally 744 × 1,052 pixels, file size: 44 KB)

Summary

Description
English: Ozanam's method (1673) and later Mayall (1973), and others. It works well in higher latitudes requiring a narrower sheet of paper.
  • Take a large sheet of paper (Two times wide as high for 52 N).
  • Starting at the bottom, draw a line across, and a vertical one up the centre. Where they cross is important call it O.
  • Choose the size of the dial, and draw a line across. Where it crosses the centre line is important call it F
  • You know your latitude. Draw a line upwards from O at this angle, this is a construction line.
  • Using a square, (drop a line) draw a line from F through the construction line so they cross at right angles. Call that point E, it is important. To be precise it is the line FE that is important as it is length .
  • Using compasses, or dividers the length FE is copied upwards in the centre line from F. The new point is called G and yes it is important- the construction lines and FE can now be erased.
  • From G a series of lines, 15° apart are drawn for 9, 10, 11 and 1, 2 and 3. A vertical line is dropped from 3.
  • A diagonal DW is drawn . From the 2 point, a line is dropped orthogonally to the diagonal. This point is called L. (similar procedure for K) Stirrup then moved his set compasses down the diagonal till he found the point N, a line right-angles to the diagonal and an exact length to the vertical. This point is the 4 marker.
  • The 4 hour line is drawn from here to the origin.
  • The values before and after 6 are calculated through symmetry.
Source Own work
Author Photograph by Clem Rutter, Rochester, Kent. (www.clemrutter.net).
Permission
(Reusing this file)
This image is licensed under a Creative Commons Attribution-Share Alike licence, which gives you permission to freely use the image for any purpose, so long as you attribute it as requested here, and make any modified versions of it available under an identical license. If you want to use this image under a different license, for example if you can't give attribution or if you can't share a derivative work under the same licence, then please get in touch.

If you use this image outside of the Wikimedia projects, then I'd appreciate it if you would let me know. Though this isn't compulsory, it seems only fair . Thanks!

Licensing

w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current14:16, 25 July 2015Thumbnail for version as of 14:16, 25 July 2015744 × 1,052 (44 KB)ClemRutter

The following page uses this file:

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "https://en.wiki.x.io/wiki/File:Stirrup_method_(1652)-(1).svg"