Saturday, February 10, 2024

Spotlight: Aristo Multilog Nr. 970 Slide Rule

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.  


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