Make a Fence for Your Framing Square

Carpenters framing square fences have been around for well over a century, but many carpenters have never heard of them. Once you've tried a framing square fence, you'll wonder why you ever bothered with stair gauges. Framing square fences work on waney-edged lumber and stay accurate when you run off the end of the stock, making them way more useful than stair gauges for laying out rafters, stairs, ladders, ramps, and anything else built on a slope.
Carpentry skills competitions consider framing square fences a 'pre-made jig' and don't allow them. The idea of this video was to see if a framing square fence could be made using lumber typically supplied in carpentry skills competitions, in a short enough time to make it worthwhile to make one during a competition.
The verdict: maybe for post-secondary, where the project includes stairs and a hip roof. In a secondary-level project, where there's only common rafters, you probably don't want to risk using that time and material - just use a speed square and a calculator.

When using an opaque framing square, you can't see the measurements on the square through the fence, so mark your rise and run on the edge of the square with a fine-tipped marker, and then line up the square with those marks. A transparent fence made of strips of acrylic sheet eliminates this issue.

Book photos are of pages 1280-1287 of the 1923 edition of: Audel's Carpenter's and Builder's Guide vol. 4.