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Bauxite sample
 

 

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Source page:

http://commons.wikimedia.org/wiki/File:Bauxite_sample.jpg

Summaryedit

U.S. quarter

This image has currency in it to indicate scale.

Avoid using objects such as coins for scale, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias, and some coins' designs are copyrighted. This is particularly true for coins such as the "dime", which non-Americans would first need to look up how many cents this equates to, then look in a table such as that below.

Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI ("metric") units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of bad practice: here.

A tape measure


Common coin diameters for reference:

  • U.S. dollar:
    • 1¢: 19.05 mm , 0.75 in
    • 5¢: 21.21 mm , 0.79 in
    • 10¢: 17.91 mm , 0.71 in
    • 25¢: 24.26 mm , 0.94 in
    • 50¢: 30.61 mm , 1.22 in
    • $1: 26.5 mm , 1.02 in
  • Canadian dollar:
    • 1¢: 19.05 mm , 0.75 in
    • 5¢: 21.2 mm , 0.83 in
    • 10¢: 18.03 mm , 0.71 in
    • 25¢: 23.88 mm , 0.94 in
    • 50¢: 27.13 mm , 1.07 in
    • $1: 26.5 mm , 1.02 in
    • $2: 28 mm , 1.1 in
  • Pound sterling
    • 1p: 20.32 mm , 0.8 in
    • 2p: 25.91 mm , 1.02 in
    • 5p: 18 mm , 0.71 in
    • 10p: 24.5 mm , 0.96 in
    • 20p: 21.4 mm , 0.84 in
    • 50p: 27.3 mm , 1.07 in
    • £1: 22.5 mm , 0.89 in
    • £2: 28.4 mm , 1.12 in
  • Euro
    • 1c: 16.25 mm , 0.64 in
    • 2c: 18.75 mm , 0.74 in
    • 5c: 21.25 mm , 0.84 in
    • 10c: 19.75 mm , 0.78 in
    • 20c: 22.25 mm , 0.88 in
    • 50c: 24.25 mm , 0.95 in
    • €1: 23.25 mm , 0.92 in
    • €2: 25.75 mm , 1.01 in

Description
English: Bauxite with one NT dolor .
中文: 鋁礬土樣本與一枚新台幣。
Date
Source Own work
Author GOKLuLe 盧樂

Licensingedit

I, the copyright holder of this work, hereby publish it under the following license:
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 attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

Photo's description:
Bauxite with one NT dolor . 中文: 鋁礬土樣本與一枚新台幣。


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EXIF data:
File name bauxite_sample.jpg
Size, Mbytes 1.9881201171875
Mime type image/jpeg
Camera manufacturer CASIO COMPUTER CO.,LTD.
Camera model EX-FH100
Orientation of image 1
Image resolution in width direction 72
Image resolution in height direction 72
Unit of X and Y resolution 2
Exposure time 1/60 sec (0.016666666666667)
F number f / 4.6
Exposure program 2
ISO speed rating 400
Compressed bits per pixel 5.1440329218107
Exif version 0221
Lens focal length 13.6 mm
Date and time original image was generated 2011:10:10 15:36:53
Date and time image was made digital data 2011:10:10 15:36:53
Meaning of each component 
Exposure bias 0
Maximum lens aperture 3.4
Metering mode 5
Light source 13
Supported Flashpix version 0100
Color space information 1
Exif image width 2304
Exif image length 1728
InteroperabilityOffset 10218
White balance 1
Digital zoom ratio 0
Focal length in 35 mm film 80 mm
Sharpness 2
Interoperability index R98
Interoperability version 0100
Software used 1.00




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