CIRCULAR SLIDE RULES Slide rules are a more robust way to do math. Slide rules are not dependent on energy infrastructure. I have also found mine to help me visualize numbers. I like my slide rules that help calculate dates, based on the 28year repeating cycle, but my most helpful slide rule is my huge, 8inch Binary Slide Rule. I once read that there were some inaccuracies on it, but that the “clutch” of the pivot arms was its most important contribution to technology. These are the numbers that are helpful to make one’s own slide rule. This first table gives the angles of the circle at which each Log value of N is located. American History Gilson Binary Circular Slide Rule

This table gives the interval around the circle between each .1 or 36 degree value.
Angle  Log N  N 
36.00  0.10  1.26 
39.60  0.11  1.29 
43.20  0.12  1.32 
46.80  0.13  1.35 
50.40  0.14  1.38 
54.00  0.15  1.41 
57.60  0.16  1.45 
61.20  0.17  1.48 
64.80  0.18  1.51 
68.40  0.19  1.55 
72.00  0.20  1.58 
This table reverses the basis and gives the degree of the circle at which each integer is located.
N  Log N  Angle 
1  0  0.0 
2  0.3010  108.4 
3  0.4771  171.8 
4  0.6021  216.7 
5  0.6990  251.6 
6  0.7782  280.1 
7  0.8451  304.2 
8  0.9031  325.1 
9  0.9542  343.5 
10  1  360.0 
I never learned about e or natural logs in school, but I finally learned how nifty it is from my Binary Slide Rule.
Each column makes up its own full circle and each row makes a column on the slide rule. Each column could have its own circle, or they could make a spiral.
0.001  0.01  0.1  1  10  
1  1.00100  1.01005  1.10517  2.71828  22,026 
2  1.00200  1.02020  1.22140  7.38906  485,165,195 
3  1.00300  1.03045  1.34986  20.086  1.07E+13 
4  1.00401  1.04081  1.49182  54.598  2.35E+17 
5  1.00501  1.05127  1.64872  148.41  5.18E+21 
6  1.00602  1.06184  1.82212  403.43  1.14E+26 
7  1.00702  1.07251  2.01375  1,097  2.52E+30 
8  1.00803  1.08329  2.22554  2,981  5.54E+34 
9  1.00904  1.09417  2.45960  8,103  1.22E+39 
10  1.01005  1.10517  2.71828  22,026  2.69E+43 