Where is the scale at?

[Maaso]

When I first joined the forum, I went through the lot of the forum pages and abused the search feature. And while I was perusing I came across this scale that showed the scale-sizes of parts. It even went as far as telling what diameter styrene tubes to get for a 1" pipe, 2" pipe, and so on. I've spent the past two-hours trying to find this scale, and I'm not having any luck.

If anyone could help me find this, I would greatly appreciate it.

-Thank you.