Now, 100 years later, you can still use this multitasking wonder as a scribing tool, a protractor ... and you’ll never start another DIY job without one.

While only one patent model for a protractor survives in the Smithsonian collections—from an inventor with a colorful personal history—several of the other objects also provide examples of technical ...

What you need: ruler, protractor, pencil and paper. Use these to construct a triangle when you know the length of 1 side and the 2 angles at each end of it. In this case use the length 8 cm ...