The flatness and levelness of concrete floors has become a big deal. If you've ever sat at a restaurant table that rocked up and down, slopping wine out of your glass and causing you to launch a ...

Since it was introduced in the 1970s, F-numbers have proven to be useful in measuring and improving concrete floor flatness and levelness. With modern finishing equipment, achieving overall floor ...

When you want to measure the length, breadth, or depth of an object, there are plenty of instruments for the job. You can start with a tape measure, move up to calipers if you need more precision, or ...

A Lou Mitchell’s pancake. A pool table at Chris’s Billiards. A thin-crust pizza from Vito & Nick’s. Each evokes one of Chicago’s overwhelmingly obvious physical features: flatness. Geologically ...