Re: Conversion percentages.
Rod Miller
Hi Denny,
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The method Jerry White showed me was to draw/tape a line that was a specific length in the scale of the image to be enlarged/reduced. E.g., an O scale (1:48) drawing would have a line, say, 2.5 inches long which represents e.g. 10 feet. Start with an approximate enlargement/reduction setting and make a copy. Measure the length of the line on the copy and determine its scale length for the scale you want. When the line is 10 e.g. feet long in the scale you want, you have the correct reduction/enlargement. E.g., suppose you want to reduce an O scale (1/4 inch = 1 foot) drawing to S scale (3/16 inch = one foot, or 1/64 inch = 1 inch). A 10 foot long line in O scale is 10 1/4s or 2.5 inches long. A 10 foot long line in S scale is 120 1/64s or 1 7/8 or 1.875. When your line on the copy is 1.875 inches long the copy is accurate for S scale. IMHO that is more accurate than calculating a reduction/ enlargement percentage. Regards, Rod Miller
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