**Spotlight: Aristo Multilog Nr. 970 Slide Rule**

Release Year: 1954

Santa Barbara and Carpentaria, California, are two of my favorite places to visit. While on vacation in December 2023 in Santa Barbara, I bought a Aristo Nr. Slide Rule at Antique Alley.

Not only did the slide rule have a nice, hard case, the slide rule is large. The slide rule also has a functional description of each scale. I also like the slide rule uses two colors, black and brown, to distinguish the scales from each other.

Side 1:

LL00: e^(-0.001X)

K: X^3 (K = D^3)

A: X^2 (A = D^2)

CF: πX

CIF: 1/(πX)

L: lg X (log X)

CI: 1/X

C: X

D: X

DI: 1/X

LL0: e^(0.001X)

Side 2:

LL01: e^(-0.01X)

LL02: e^(-0.1X)

LL03: e^(-X)

DF: πX

B: X^2

T: ∡tg (tan X, X is in degrees, tan D° = T)

ST: ∡arc (tan X, sin X)

S: ∡sin (arcsin X, sin D° = T)

C: X

D: X

LL3: e^X (LL3 = e^D)

LL2: e^(0.1X)

LL1: e^(0.01X)

As a bonus, the slide rule came with a reference card. One one side is the Dietzgen Slide Rule Conversion Tables (U.S. and SI units, 1950), and other side is a table of common areas, surface areas, volumes, and trigonometric properties of the right triangle. I don't know if this was standard addition when the Aristo Multilog Nr. 970 was sold.

This may be my favorite slide rule: not only the scales are large (and as a result easier on the eyes to read), but the fact that there are function descriptions on the scales is a big plus.

Eddie

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