Templot Club Archive 2007-2020
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posted: 3 Sep 2008 15:02 from: Raymond
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Hello all, I have a track plan that is 90mm by 35mm (about 3.5x1.75 inches) whose scale is given in chains. The real plan therefore must have been around 181 by 330 feet. I am stuck because I do not know how to convert these measurements into a meanful ratio I cn enter into Templot. If anyone can help I'd be very gratefull. Regards Raymond |
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posted: 3 Sep 2008 15:35 from: Nigel Brown click the date to link to this post click member name to view archived images |
There's something funny about the figures you give; the metric and imperial ratios are different. However, in principal:- 1 chain = 22 yards = 66 feet. So you can convert any chain measurement to feet. Divide the result into the equivalent measurement in mm, and that will give you a "modelling scale" for the plan, in the form X mm/ft. That may help. Not sure where you go from there since it's sometime since I did it, but I'm sure there's explicit instructions on importing plans of a known scale into Templot somewhere. |
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posted: 3 Sep 2008 15:42 from: Martin Wynne
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Raymond wrote: I have a track plan that is 90mm by 35mm (about 3.5x1.75 inches) whose scale is given in chains. The real plan therefore must have been around 181 by 330 feet. I am stuck because I do not know how to convert these measurements into a meaningful ratio I can enter into Templot. Hi Raymond, The physical size of the plan is irrelevant (assuming it hasn't been reduced on photocopying).  What does the scale actually say? One chain is 66 feet. So if the scale says "2 chains to an inch" that means 132ft to an inch. 132ft is 1584 inches. So that makes the scale 1584 inches to one inch, or 1:1584 as a ratio. So after scanning the plan, you would enter the scale as 1584 in Templot when creating a picture shape for it. Just to repeat (this confuses a lot of folks) -- the actual size of the plan you are scanning is irrelevant, if you know the scale. regards, Martin. |
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posted: 3 Sep 2008 16:10 from: Raymond
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Hi Martin & Nigel, Thanks for your very prompt and helpful replies. There is no actual scale ratio given inthe plan, it must has a rule at the bottom marked out in chains. Regards Raymond |
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posted: 3 Sep 2008 16:50 from: Martin Wynne
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Raymond wrote: There is no actual scale ratio given in the plan, it just has a rule at the bottom marked out in chains.Hi Raymond, How long is the rule? How many chains does it represent? If it is 3 inches long and represents 12 chains, that means the scale is 4 chains to an inch. Then see my previous reply. When reading how many chains it represents, take account of the position of the zero mark. It might be helpful if you attach the scan here. regards, Martin. |
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