I also worked as a Tool Maker for 35 years before retiring 2 years ago. I used them as bluegrallis did with a height gage to set precise angles on sine plates. By using, for example, a 10" sine plate, you would determine what angle you wanted to accomplish, fine the SINE of that angle, multiply that by 10 for the 10" sine plate (or 5 for a 5" sine bar). This is the height you would set the planer gage to and the let the "boss" of the sine plate/bar on it to achieve the angle. The extra bars are just extensions so you can achieve higher heights and as such, steeper angles.

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