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).
In case this is not legally possible: William Grimes ngawèhaké sapa waé hak migunakaké karya iki kanggo maksud apa waé, tanpa katemton apa waé, kajaba ana katemton sing dibutuhaké déning hukum.
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Halaman deskripsi aslinya ada di sini. Semua nama pengguna berikut merujuk pada en.wikipedia.
2007-01-19 19:18 William Grimes 899×611×8 (446470 bytes) U.K. Prototype model of an 00 scale (1:76.2) British Railway Class 25 shown with 5 pence for size, Photo by William J. Grimes.
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{{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|U.K. Prototype model of an OO scale (1:76.2) en:British Railwaysen:Class 25 shown with 5 en:pence for size, Photo by William J. Grimes.}} |Source=Transfered from [http://en