Write ups:
                        K & E Log Log Vector Slide Rule

               Out of curiosity on how computation of  complex  domain
          elementary functions can be done, I got a rare 4083-3. For a
          25cm straight slide rule the accuracy is about 3 to 4 digits
          with  estimation,  which  is  close  to  what  today's half-
          precision binary floating-point can get. It  lacks  K  scale
          for  cubic  square/root compared to the more common Decitrig
          model 4081, but the Log Log scales compensate for that.

               The supplement manual only did explain how  to  compute
          hyperbolic  functions  of  complex numbers, but I am able to
          find other resources that gives the  formula  and  it  is  a
          surprise  the  same formula is still used by Common Lisp and
          gives good accuracy. I have also  added  several  uncommonly
          seen  tricks  not  converged in the Decitrig manual to prove
          that Log Log Vector can compute anything that an  electronic
          scientific  calculator  could do, albeit it needs skills and
          knowledge to close that gap.