Albert Nestler, Lahr in Baden / Germany (1940) *************************************************************** VERSION (B) S C A L E S of the N E S T L E R » RIETZ « Model 23R/3 =============================================================== Front Side [ inverse / RED ] Back Side =============================================================== ( 0 ... 27 cm Ruler ) K X3 A X2 --------------------------------------------------------------- B X2 S sin(0.1X) [CI] [1/X] ST arc(0.01X) C X T tan(0.1X) --------------------------------------------------------------- D X L lgX ( 1:25 Ruler ) R E M A R K S : ( 1° = 60' ; 1' = 60" ) =============================================================== The TRIGONOMETRIC SCALES are divided in MINUTES(') & SECONDS(") This historic wooden model with its cardboard case is shown on the booklet » Einfuehrung in die Anwendung der NESTLER Rechen- schieber RIETZ und DARMSTADT « (40 p. with an introduction and 106 calculating exercises). On the back side of the slide rule is a table with physical constants. The "R" refers to the 1/X, RECIPROCAL SCALE. The "/3" on the CASE refers to 3 HAIRLINES on the CURSOR. Historical Remarks ... There are 2 Versions in the Collection -------------------------------------- Have a look at the Older Version (A) impressum: *************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 04/26/07 |