A recent visit from another Creeker brought up a question about rip sawing wood. How do you keep the cut square. My answer was that after sawing awhile, one gets a feel. Any final squaring is done with a plane.
That got me to thinking about some of the drafting tools my father made when he was in school before WW II. So I made a few 30 - 60 triangles.
30º - 60° Triangle.jpg
The thicker one makes a good guide when ripping wood.
Triangle Guide.jpg
The hole can be used as a thumbhole to hold the triangle and the edge of the wood. It is also thick enough to stand on its own if you are using both hands on the saw.
Schools must have been a lot different back in the day of making your own drafting equipment. That was before my time. Then you would draw something and make it in shop. Much more rounded than the video game world of today.
jtk