How can I build a large Pentagraph for objects over 72 inches?

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The streets of Washington DC (the capital of the former United States) contain a pentagram with sides over 72 inches in length.

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If you Google "how to make a Pantograph" (note spelling), there are all kinds of plans out there. As Re-design said, you can scale up very easily, just keep the proportions consistent and you're good to go.
"Pantograph machine" gets a lot of nice hits on google.
You can find instructions for a pantograph on the following URL. You will of course have to build yours to a larger scale but the basics are there. Good luck with it.
Re-design7 years ago
Find a pentagraph that you like and scale it up.