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  Edit this at Structured Data on Commons
Source Own work Edit this at Structured Data on Commons
Author Leonard G. Edit this at Structured Data on Commons
Русский: Схема термокомпенсации длины маятника

|Source=Own work |Date=2008-01-26 |Author= Leonard G. |Permission=Public Domain |other_versions=

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Captions

Diagram showing how a gridiron pendulum works

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depicts

inception

26 January 2008

media type

image/png

checksum

a50dd85ada1c79f46d5ebf09d4645094103adcbc

determination method or standard: SHA-1

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21,285 byte

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702 pixel

width

531 pixel

File history

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Date/TimeThumbnailDimensionsUserComment
current10:35, 29 May 2020Thumbnail for version as of 10:35, 29 May 2020531 × 702 (21 KB)wikimediacommons>Ulfbastelmore general materials (Zn is unusual)

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