"SPECIAL" SLIDE RULES WITH HYPERBOLIC SCALES:
These slide rules are not shown on the listing, but are listed below:
1. The UltraLog Slide Rule: made by, Zvi Doron: http://www.zvidoron.com/
It may be seen at: http://www.youtube.com/watch?v=NJZnw27VJ6s
This is a Slide Rule that might possibly be sold in the future. It is not VIRTUAL.
Front scales: || LL/0, LL/1, LL/2, LL/3, DF || CF, CIF, SH1, SH2, CH, TH, L, CI, C || D, LL3, LL2, LL1, LL0 ||
Back scales: || R1, R2, K, A || B, T1, T2, ST, S, P, H1, H2, CI, C || D, DI, Q1, Q2, Q3 ||
2. The "Electronics" Slide Rule: made by Derek: email@example.com
This Slide Rule is on paper to be cut and glued to a ThinkGeek Nanoline 1337 slide rule body. It is a "hemmi266-tg-pdf" uploaded file entered in firstname.lastname@example.org
Front scales: || LL03, LL02, LL2, A || B, BI, Sh1, Sh2, Th, CI, C || D, DI, P, L ||
The back scales are mostly Electronic. On some of the the back scales there are two scales. These are marked with different symbols on the right and the left sides, and shown below.
Back scale marked on right side: || XL,Xc,F, r1 || r2, ST, S& S, T& T, L, Cf/C, Cz || L, Z, Fo ||
Back scale marked on left side: || TL, R,Tc, Fm, P || Q, ST, S& S, T& T, L, C || Z, Fo ||
Gauge Marks on scales: p is on A, B, C, D, BI, CI, and DI; p/4 is on A, B, and BI; 1o, ", and ', are on back ST scale.
The S, T, and ST scales are used by turning the slide over to place the C or D scales near them.
3. "The Everitt Complex Hyperbolic Slide rule of 1924". In JOS Volume 21, Number 1, Sping 2012 is an Article discussing this unusual slide rule. It was not manufactured as the Eckel circular slide rule was (See Number 26 in the listings).
However, the Everitt slide rule is a very remarkable circular slide rule.