Hello
It's no longer a question, it's a solution!
I needed to establish a logarithmic scale and Draftsigth does not provide that, to my humble knowledge.
Here is a solution based on my years as an electronics technician.
- draw a line segment equivalent to the modulus of the desired scale - length "m" - , thus starting from 1 and ending at 10
-Let's position the graduation 2, i.e. M×log 2 = m × .301, in red on the drawing - length l -.
-let's position graduation 3, i.e. m×log 3 = m × .477, in green on the drawing -length L -.
-note that 4 = 2×2 i.e. 2 × log 2 of the same 8 = 2×2×2 so we transfer 2 times end to end the length (l) taken between 1 and 2 to successively obtain the graduations 4 and 8.
- 6 = 3 × 2 so we transfer the length (l) from graduation 3 and we get graduation 6
- 5 = 10 / 2 i.e. in log 10 - log 2, we start from the graduation 10 to return from the length (l) (corresponding to log of 2)
- 9 = 3 × 3 i.e. log 3 + log 3 , so we transfer the length (L) from graduation 3 and we obtain graduation 9,
- all that remains is to carry the log 7 graduation, i.e . M×log 3 = m × .. 845 from LOA graduation 1, in yellow on the drawing.
If you need to have 2, 3, n modules, you know better than I do to put the necessary modules end to end.
Give your different methods, I'm interested.
Thank you for your attention.
echelle_logaritmique.dwg