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File:BanjoPendulum.png

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Description
English: Diagram showing operation of temperature compensated "gridiron" pendulum, invented in 1726 by British clockmaker John Harrison. The pendulum uses rods of a high thermal expansion metal, zinc (yellow) to compensate for the expansion of rods of a low thermal expansion metal, iron (blue), so the overall pendulum doesn't change in length with temperature changes. Therefore the period of swing of the pendulum, and the rate of the clock, are constant with temperature.
  • A: general external appearance of pendulum
  • B: schematic at normal temperature
  • C: schematic at higher temperature
Created for and referenced from the English Wikipedia article Gridiron pendulum. Note: I can provide original drawing for conversion to scalable format.
Date
Source Own work
Author Leonard G.
Permission
(Reusing this file)
Public Domain


Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Captions

Diagram showing how a gridiron pendulum works

Items portrayed in this file

depicts

26 January 2008

image/png

a50dd85ada1c79f46d5ebf09d4645094103adcbc

21,285 byte

702 pixel

531 pixel

File history

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Date/TimeThumbnailDimensionsUserComment
current09:35, 29 May 2020Thumbnail for version as of 09:35, 29 May 2020531 × 702 (21 KB)Ulfbastelmore general materials (Zn is unusual)
23:57, 15 June 2016Thumbnail for version as of 23:57, 15 June 2016531 × 702 (7 KB)W like wikimore clear (just blue and yellow)
23:53, 15 June 2016Thumbnail for version as of 23:53, 15 June 2016531 × 702 (7 KB)W like wikisame blue ;)
05:26, 27 January 2008Thumbnail for version as of 05:26, 27 January 2008531 × 702 (5 KB)Leonard G.Improved version of my image
05:11, 27 January 2008Thumbnail for version as of 05:11, 27 January 2008531 × 702 (5 KB)Leonard G.
21:24, 26 January 2008Thumbnail for version as of 21:24, 26 January 2008477 × 657 (5 KB)Leonard G.{{Information |Description=Temperature compensated "banjo" pendulum |Source=self-made |Date=January 26, 2008 |Author= Leonard G. |Permission=Public Domain |other_versions= }} A: general external appearance of pendulum B: schematic at

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