File:5.25 inch MFM hard disk drive.JPG

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5.25_inch_MFM_hard_disk_drive.JPG ‎(640 × 512 pixels, file size: 120 KB, MIME type: image/jpeg)

Description The large drive is a 5.25" full-height 111 MB MFM drive. The smaller drive is a 2.5" 6495 MB IDE drive. The coins at bottom are a US cent (left, 19 mm) and a UK penny for size comparison.
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Source Photo by Ian Wilson
Author User Redgrittybrick on en.wikipedia
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Originally from en.wikipedia; description page is (was) here

* 17:50, 25 June 2006 [[:en:User:Redgrittybrick|Redgrittybrick]] 640×512 (123,021 bytes) <span class="comment">((Photo by Ian Wilson))</span>


This image has currency in it to indicate scale.

Using coins for scale is discouraged as it 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 can also reinforce a geographical bias, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter).

Images with coins to indicate scale

Common coin diameters for reference:

  • U.S. dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.21 mm, 0.84 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 (as of?):
    • 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 as of 2021:
    • 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: 23.03–23.43 mm, 0.91–0.92 in
    • £2: 28.4 mm, 1.12 in
  • Euro as of 2002:
    • 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

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Date/TimeThumbnailDimensionsUserComment
current19:41, 24 July 2006Thumbnail for version as of 19:41, 24 July 2006640 × 512 (120 KB)Liftarn{{Information| |Description=The large drive is a 5.25" full-height 111 MB MFM drive. The smaller drive is a 2.5" 6495 MB IDE drive. The coins are a US cent and a UK penny for size comparison. |Source=Photo by Ian Wilson |Date= |Author=User [[:en:User:Redg
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