@jackenglishmachines: With the advent of CAD and computer-aided design, we don’t actually draw to scale anymore. That’s really a remnant of the old drafting tables, where everything had to be drawn at a scale that would allow the actual size of the project to fit on the drawing. We still print drawings to scale, but in CAD we’re drawing full-size, so there isn’t any correction being made as we draw. Most plans are still printed at the standard quarter-inch-to-the-foot scale simply because it fits conveniently on the paper that architectural plans are generally produced on. So here we’re using that same principle, with a scale ruler, which is remarkably accurate, to measure certain elements directly from a photograph. We need to know at least one actual measurement so that the proportions of everything else can be scaled correctly. The larger the known dimension, the more accurate the result. But with a scale ruler, it’s easy to get within a quarter of an inch. And since this is way up in the sky, we don’t need to be working to a sixteenth of an inch. A quarter inch is plenty accurate for what we’re doing.

Jack forsberg

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Monday 28 September 2026 18:00:14 GMT