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One of the reasons scale is confusing might be that there are two ways of identifying scale.The simpler way is stating the ratio; like 1:20.1 and 1:32. Even simpler is stating using a fraction, 1/20.1 and 1/32.  This is because no units of measurement are necessary.  You can divide 1 meter by 32 getting an answer in the metric system, meter, cm, or mm; or you divide 3 feet by 32 and get an answer in feet (or inches).  The other way of identifying scale is what a unit of measurement equals one foot.  O scale has 1/4 of an inch equalling a foot so it's referred to as quarter inch scale.  And HO scale has 3.5mm equalling a foot so its referred to as 3.5mm scale - not nice as we have both metric and Old English mixed together.IMHO, I think using 1:48 for O scale and 1:87.1 for HO scale and the plethora we have for 45mm gauge is much less confusing. Just divide by the second number and remember that 1/4 is smaller than 1/3 even though 4 is larger than 3!Art
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