Image:PhosphateRockUSGOV.jpg

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Phosphate rock

Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by Chris 73

Public domain This image is a work of the "Minerals in Your World" project, a cooperative effort between the United States Geological Survey and the Mineral Information Institute. The images were featured in the "Minerals and Materials Photo Gallery" on the website of the U.S House Subcommittee on Energy and Natural Resources. As a work of the U.S. federal government, the image is in the public domain.
U.S. quarter
A tape measure
This image has a coin in it to indicate scale.

Do not rely solely on coins or other "common" objects for scale, as it will require people unfamiliar with it to look up its dimensions or guess, both of which defeat the purpose of the coin in the first place.

Please photograph an object such as a ruler or add a scale marking in via an image editor instead. Standard units such as SI/metric units should be used (See metre, 1 E-2 m).

Examples of good practice: with superimposed line.
Examples of bad practice: here.

Common coin diameters for reference:

  • U.S. and Canada:
    • 1¢: 19 mm, 0.75 in;
    • 5¢: 20 mm, 0.79 in;
    • 10¢: 18 mm, 0.71 in;
    • 25¢: 24 mm, 0.95 in;
    • 50¢: 30 mm, 1.18 in;
    • $1: 26 mm, 1.02 in;
    • $2: 28 mm, 1.10 in.
  • UK
    • 1p: 20.32 mm, 0.80 in;
    • 2p: 25.91 mm, 1.02 in;
    • 5p: 18.00 mm, 0.71 in;
    • 10p: 24.50 mm, 0.96 in;
    • 20p: 21.40 mm, 0.84 in;
    • 50p: 27.30 mm, 1.07 in;
    • £1: 22.50 mm, 0.89 in;
    • £2: 28.40 mm, 1.12 in.
  • Eur
    • 1¢: 16.25 mm,
    • 2¢: 18.75 mm,
    • 5¢: 21.25 mm,
    • 10¢: 19.75 mm,
    • 20¢: 22.25 mm,
    • 50¢: 24.25 mm,
    • 1€: 23.25 mm,
    • 2€: 25.75 mm,

The following pages on the English Wikipedia link to this file (pages on other projects are not listed):

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