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Lan Switch
 

 

 

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Source page: http://commons.wikimedia.org/wiki/File:Lan_Switch.JPG
Description LAN Switch, 5 ports, 10/100 Mbit
Date 12 December 2006(2006-12-12)
Source Own work
Author Lukasz Szymanek (filque)
Permission
(Reusing this file)
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.5 Generic 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).

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.

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



Licensing:
Creative Commons Attribution 2.5 Generic

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EXIF data:
File name lan_switch.jpg
Size, Mbytes 0.55686328125
Mime type image/jpeg
Camera manufacturer Canon
Camera model Canon PowerShot A540
Orientation of image 1
Image resolution in width direction 180
Image resolution in height direction 180
Unit of X and Y resolution 2
Exposure time 1/60 sec (0.0166666666667)
F number f / 4
Compressed bits per pixel 5
Exif version 0220
Lens focal length 5.8 mm
Date and time original image was generated 2006:12:12 22:29:56
Date and time image was made digital data 2006:12:12 22:29:56
Meaning of each component 
Shutter speed 5.90625
Aperture 4
Exposure bias 1.33333333333
Maximum lens aperture 2.75
Metering mode 2
User comments
Supported Flashpix version 0100
Color space information 1
Exif image width 1600
Exif image length 1200
InteroperabilityOffset 2824
Focal plane X resolution 7111.11111111
Focal plane Y resolution 7100.59171598
Focal plane resolution unit 2
Sensing method 2
Exposure mode 1
White balance 1
Digital zoom ratio 1
Interoperability index R98
Interoperability version 0100
Type of image IMG:PowerShot A540 JPEG
Firmware version Firmware Version 1.00
Image number 1000049
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