List of Slide-Rules

For slide-rule freaks only, a detailed list of my slide-rules. Instructions for using one are here.

AW Faber 309. 250mm scale. Wooden structure with white plastic facing pinned on. Single-sided with double-sided slide. Two cursors, wooden with plastic window. S, L and T scales can also be read from windows on the back. Scales on the front are unnamed. Made in Bavaria. Thanks to Emrys for this one.

upper stock (A) x²

slide (B) x²

(C) x

lower stock (D) x

back of slide S arcsin 0.01x²

L 1 - log x (reads log x via window on reverse)

T arctan 0.1x


upper stock	(A)	x²
slide	(B)	x²
(C)	x
lower stock	(D)	x

back of slide	S	arcsin 0.01x²
L	1 - log x (reads log x via window on reverse)
T	arctan 0.1x

Faber-Castell 167/98 Log-Log. 125mm scale. Single-sided one-piece plastic body, with windows on reverse to read S, L and T scales with double-sided slide in normal position. Single-piece plastic cursor with area of circle and (746W)HP to kW. 5-inch scale along ruler-edge at top. Leather slip case. Made in Germany. I bought this one new and carried it always, until Joan sat on it in 1981 and cracked it. It still works.

upper stock LL2 e^0.1x

A x² (with extensions, as have B, CI, C and D)

slide B x²

CI 10/x

C x

lower stock D x

LL3 e^x

Efficiency Efficiency of motor or dynamo based on HP to kW ratio on A and B

Volt drop Volt drop in copper cable, based on area, length and current set on A and B using special marks

back of slide S arcsin 0.01x²

L 1 - log x (reads log x via window on reverse)

T arctan 0.1x

Faber-Castell 167/98b Elektro. The same as 167/98 above, except: 735W=HP, centimeter ruler scale and plastic slip-case. Also the volt drop and efficiency scales are displaced to reflect metric units and continental HP. Clive Bowman found this one and the next one in London around 1982.


upper stock	LL2	e^0.1x
A	x² (with extensions, as have B, CI, C and D)
slide	B	x²
CI	10/x
C	x
lower stock	D	x
LL3	e^x
Efficiency	Efficiency of motor or dynamo based on HP to kW ratio on A and B
Volt drop	Volt drop in copper cable, based on area, length and current set on A and B using special marks

back of slide	S	arcsin 0.01x²
L	1 - log x (reads log x via window on reverse)
T	arctan 0.1x

upper stock LL2 e^0.1x

A x² (with extensions, as do B, CI, C and D)

slide B x²

CI 10/x

C x

lower stock D x

LL3 e^x

Efficiency Efficiency of motor or dynamo based on HP to kW ratio on A and B

Volt drop Volt drop in copper cable, based on area, length and current set on A and B using special marks

back of slide S arcsin 0.01x²

L 1 - log x (reads log x via window on reverse)

T arctan 0.1x


upper stock	LL2	e^0.1x
A	x² (with extensions, as do B, CI, C and D)
slide	B	x²
CI	10/x
C	x
lower stock	D	x
LL3	e^x
Efficiency	Efficiency of motor or dynamo based on HP to kW ratio on A and B
Volt drop	Volt drop in copper cable, based on area, length and current set on A and B using special marks

back of slide	S	arcsin 0.01x²
L	1 - log x (reads log x via window on reverse)
T	arctan 0.1x

Faber-Castell 62/83N Novo Duplex. 125mm scale. Double-sided plastic with wrap-around two-piece plastic cursor. All scales have extensions. Cursor has area of circle, kW to HP (746W) and x36. Leather slip case. This and the next two Fabers have metal rod bearings for the cursor. Made in Germany. My favourite.

front upper stock T1 arctan 0.1x (and arccot)

T2 arctan x (and arccot)

K x³

A x²

DF pi.x

front of slide CF pi.x

B x²

CIF 10/(pi.x)

CI 10/x

C x

front lower stock D x

DI 10/x

S arcsin 0.1x (and arccos)

ST arc 0.01x (arctan or arcsin)

P sqrt(1-(0.1x)²)

rear upper stock LL03 e^-x

LL02 e^-0.1x

LL01 e^-0.01x

LL00 e^-0.001x

W2 sqrt(10x)

rear of slide W2' sqrt(10x)

CI 10/x

L 0.5 log x (use with W scales)

C x

W1' sqrt x

rear lower stock W1 sqrt x

D and LL0 x and e^0.001x (ingeniously-marked dual scale)

LL1 e^0.01x

LL2 e^0.1x

LL3 e^x


front upper stock	T1	arctan 0.1x (and arccot)
T2	arctan x (and arccot)
K	x³
A	x²
DF	pi.x
front of slide	CF	pi.x
B	x²
CIF	10/(pi.x)
CI	10/x
C	x
front lower stock	D	x
DI	10/x
S	arcsin 0.1x (and arccos)
ST	arc 0.01x (arctan or arcsin)
P	sqrt(1-(0.1x)²)

rear upper stock	LL03	e^-x
LL02	e^-0.1x
LL01	e^-0.01x
LL00	e^-0.001x
W2	sqrt(10x)
rear of slide	W2'	sqrt(10x)
CI	10/x
L	0.5 log x (use with W scales)
C	x
W1'	sqrt x
rear lower stock	W1	sqrt x
D and LL0	x and e^0.001x (ingeniously-marked dual scale)
LL1	e^0.01x
LL2	e^0.1x
LL3	e^x

Faber-Castell 2/82. 250mm scale. Double-sided plastic with wrap-around cursor in white plastic with separate windows. Metal adjustable bridge pieces. Cursor lines for area of circle and (735W)HP to kW. Most front scales have extensions. Plastic hinged case. Made in Germany. Thanks to Mike for this one. This one's flawed for me by having C/D and CF/DF on opposite sides; CF/DF should be where the useless paired K scales are and C/D where CF/DF are.

front upper stock L log x

T1 arctan 0.1x (and arccot)

T2 arctan x (and arccot)

A x²

front of slide B x²

BI 100/x²

CI 10/x

C x

front lower stock D x

ST arc 0.01x (arctan or arcsin)

S arcsin 0.1x (and arccos)

P sqrt(1-(0.1x)²)

rear upper stock LL03 e^-x

LL02 e^-0.1x

LL01 e^-0.01x

K x³ (unusual paired K for calculations)

rear of slide K' x³

C x

CIF 10/(pi.x)

CF pi.x

rear lower stock DF pi.x

LL1 e^0.01x

LL2 e^0.1x

LL3 e^x


front upper stock	L	log x
T1	arctan 0.1x (and arccot)
T2	arctan x (and arccot)
A	x²
front of slide	B	x²
BI	100/x²
CI	10/x
C	x
front lower stock	D	x
ST	arc 0.01x (arctan or arcsin)
S	arcsin 0.1x (and arccos)
P	sqrt(1-(0.1x)²)

rear upper stock	LL03	e^-x
LL02	e^-0.1x
LL01	e^-0.01x
K	x³ (unusual paired K for calculations)
rear of slide	K'	x³
C	x
CIF	10/(pi.x)
CF	pi.x
rear lower stock	DF	pi.x
LL1	e^0.01x
LL2	e^0.1x
LL3	e^x

Faber-Castell 52/82. 250mm scale. Double-sided plastic with 2-piece plastic wrap-around cursor. Cursor has area of circle (746W) HP to kW and x36. Rigid plastic slip case. Made in Switzerland. This one saw me through upper school and university (probably bought about 1969). Before this I used a 125mm Unique and then a 250mm Blundell.

front upper stock L log x

K x³

A x²

front of slide B x²

CI 10/x

C x

front lower stock D x

LL1 e^0.01x

LL2 e^0.1x

LL3 e^x

rear upper stock T1 arctan 0.1x (and arccot)

T2 arctan x (and arccot)

DF pi.x

rear of slide CF pi.x

CIF 10/(pi.x)

CI 10/x

C x

rear lower stock D x

S arcsin 0.1x (and arccos)

ST arc 0.01x (arctan or arcsin)

P sqrt(1-(0.1x)²)


front upper stock	L	log x
K	x³
A	x²
front of slide	B	x²
CI	10/x
C	x
front lower stock	D	x
LL1	e^0.01x
LL2	e^0.1x
LL3	e^x

rear upper stock	T1	arctan 0.1x (and arccot)
T2	arctan x (and arccot)
DF	pi.x
rear of slide	CF	pi.x
CIF	10/(pi.x)
CI	10/x
C	x
rear lower stock	D	x
S	arcsin 0.1x (and arccos)
ST	arc 0.01x (arctan or arcsin)
P	sqrt(1-(0.1x)²)

Pickett N 3-T. 250mm scale. Double-sided aluminium body with adjustable metal bridge pieces. Thin and rather wobbly cursor with separate windows. Scales apparently printed on rather than engraved. Strange spring friction devices near centre position of slide make setting awkward at some positions. Compared with the other rules above, the slide is relatively much wider; also the two parts of the stock are of different widths. Sturdy leather carrying case with belt loop. Made in USA. Thanks to John for this one.

front upper stock square root x^1/2 (odd number of digits)

square root (10x)^1/2 (even number of digits)

K x³

A x²

front of slide B x²

ST arc 0.01x (arctan or arcsin)

S arcsin 0.1x (and arccos)

T arctan 0.1x

T arctan x

CI 10/x

C x

front lower stock D x

DI 10/x

cube root x^1/3 (for 1-4-7.. digits)

cube root (10x)^1/3 (for 2-5-8.. digits)

cube root (100x)^1/3 (for 3-6-9.. digits)

rear upper stock LL0+ e^0.001x (Faber LL0)

LL0- e^-0.001x (Faber LL00)

LL1+ e^0.01x

LL1- e^-0.01x

DF pi.x

rear of slide CF pi.x

CIF 10/(pi.x)

Ln ln x

L log x

CI 10/x

C x

rear lower stock D x

LL2+ e^0.1x

LL2- e^-0.1x

LL3+ e^x

LL3- e^-x


front upper stock	square root	x^1/2 (odd number of digits)
square root	(10x)^1/2 (even number of digits)
K	x³
A	x²
front of slide	B	x²
ST	arc 0.01x (arctan or arcsin)
S	arcsin 0.1x (and arccos)
T	arctan 0.1x
T	arctan x
CI	10/x
C	x
front lower stock	D	x
DI	10/x
cube root	x^1/3 (for 1-4-7.. digits)
cube root	(10x)^1/3 (for 2-5-8.. digits)
cube root	(100x)^1/3 (for 3-6-9.. digits)

rear upper stock	LL0+	e^0.001x (Faber LL0)
LL0-	e^-0.001x (Faber LL00)
LL1+	e^0.01x
LL1-	e^-0.01x
DF	pi.x
rear of slide	CF	pi.x
CIF	10/(pi.x)
Ln	ln x
L	log x
CI	10/x
C	x
rear lower stock	D	x
LL2+	e^0.1x
LL2-	e^-0.1x
LL3+	e^x
LL3-	e^-x

Aristo 0908 Trilog. 251mm scale. Double-sided plastic, with bridge pieces on one side only. Wrap-around cursor with separate windows. Cursor lines for area of circle and x36. Upper and lower stock of different widths. Rigid plastic slip case. Made in Austria. Thanks to Dave for this one and the Jakar.

front upper stock LL1 e^0.01x

LL2 e^0.1x

LL3 e^x

DF pi.x

front of slide CF pi.x

CIF 10/(pi.x)

CI 10/x

C x

front lower stock D x

L log x

K x³

rear upper stock T1 arctan 0.1x (and arccot)

T2 arctan x (and arccot)

A x²

rear of slide B x²

BI 100/x²

CI 10/x

C x

rear lower stock D x

P sqrt(1-(0.1x)²)

S arcsin 0.1x (and arccos)

ST arc 0.01x (arcsin or arctan and arccot or arccos)

Jakar No 1005. 250mm scale. Single-sided plastic with one-piece plastic cursor. Flimsy clear plastic slip case. Made in Japan.

upper stock S arcsin 0.01x²

K x³
A x²

slide B x²

CI 10/x

C x

lower stock D x

L log x

T arctan 0.1x
Logarex 4542-27501. 498mm scale. Single-sided plastic with one-piece rather vague cursor. Cursor has area of circle line. Scales appear to be printed on and varnished over. Extensions on A, B, C and D. Scales unnamed, though formula appears at left-hand end. My brother found this in Romania, at the equivalent of about 50p UK in 1991. It may be genuine, or a cheap local version. Showy fake skin fold-around case.

upper stock log x log x

x³ x³

x² x²

slide x_z² x²

1/x 10/x

x_z x

lower stock x x

sin arcsin 0.01x² (yes based on A, though at the bottom)

tg arctan 0.1x

e^x e^x
School teaching rule. 1500mm scale. Solid wooden construction, with large graduation marks, basically a 250mm rule magnified six times. Scales painted on. Found in a school's maths department cupboard. Probably dates from 1950s, and unused for twenty years. Thanks to Rusty for this one.

upper stock A x²

slide B x²

C x

lower stock D x
Faber Castell 380. Scale 500mm. Wooden slide and stock with engraved plastic faces and brass pins. Double-sided slide with trig windows on the back. Metal cursor with a single line. Conversion factors and properties of materials on the back. Wood and canvas rigid case. Made in Bavaria. No scale values or names on the front, but has "Quot +1" at LH end of D and "Prod -1" at RH end to remind of index change. Inch and mm scales on stock. Stock is in two pieces with metal springs between. Thanks to Mike for this one and the next one.

upper stock (A) x²

slide (B) x²

(C) x

lower stock (D) x

back of slide S arcsin 0.01x²

L 1 - log x (reads log x via window on reverse)

T arctan 0.01x²
Unique "Brighton". Scale 254mm. Wooden slide and stock. Stock halves joined by springy metal plate with printed formulae. Log-log on reverse of slide. Trig scales on separate scale on lower edge of lower stock, read using a special extra window on the cursor. Cm scale at upper stock. Made in England.

upper stock cube x³

A x²

slide B x²

1/x 10/x

C x

lower stock D x

L log x

sqrt(1-x²) sqrt(1-(0.1x)²)

lower edge S arcsin 0.1x

T arctan 0.1x

back of slide LL1 e^0.01x

LL2 e^0.1x

LL3 e^x
Blundell Descal 310 circular. Effective scale length about 180mm for C and D scales. Two plastic disks and clear cursor, pivoted at centre. Cicular slide rules avoid the need to reverse the slide and are easier to carry for a given scale length (this one's about 75mm diameter), but they're not so easy to manipulate. Thanks to Malcolm for this one.

outer rotor L log x

D x

inner rotor C x

CI 10/x

A x²

K x³
Sterling Mannheim. Scale 250mm. A basic plastic rule aimed at students, made in the USA. No frills, no cursor lines, not even a pi mark on the C and D scales (though oddly there is one on the A and B scales). This one is still in its original bubble pack priced at 1.49USD, probably early 1970s. Thanks to Santiago in Spain for this one and the next one.

upper stock A x²

slide B x²

CI 10/x

C x

lower stock D x

K x³

back of slide S arcsin 0.01x²

L log x

T arctan x
Sterling Mannheim De-Luxe. Scale 250mm. The same slide rule as the one above but bonded to an extra plastic base with ruler edges, 1/16-inch at the top and 0.05-inch at the bottom. In a plastic slip case.

upper stock A x²

slide B x²

CI 10/x

C x

lower stock D x

K x³

back of slide S arcsin 0.01x²

L log x

T arctan x


front upper stock	LL1	e^0.01x
LL2	e^0.1x
LL3	e^x
DF	pi.x
front of slide	CF	pi.x
CIF	10/(pi.x)
CI	10/x
C	x
front lower stock	D	x
L	log x
K	x³

rear upper stock	T1	arctan 0.1x (and arccot)
T2	arctan x (and arccot)
A	x²
rear of slide	B	x²
BI	100/x²
CI	10/x
C	x
rear lower stock	D	x
P	sqrt(1-(0.1x)²)
S	arcsin 0.1x (and arccos)
ST	arc 0.01x (arcsin or arctan and arccot or arccos)


upper stock	S	arcsin 0.01x²
K	x³
A	x²
slide	B	x²
CI	10/x
C	x
lower stock	D	x
L	log x
T	arctan 0.1x


upper stock	log x	log x
x³	x³
x²	x²
slide	x_z²	x²
1/x	10/x
x_z	x
lower stock	x	x
sin	arcsin 0.01x² (yes based on A, though at the bottom)
tg	arctan 0.1x
e^x	e^x


upper stock	A	x²
slide	B	x²
C	x
lower stock	D	x


upper stock	(A)	x²
slide	(B)	x²
(C)	x
lower stock	(D)	x

back of slide	S	arcsin 0.01x²
L	1 - log x (reads log x via window on reverse)
T	arctan 0.01x²


upper stock	cube	x³
A	x²
slide	B	x²
1/x	10/x
C	x
lower stock	D	x
L	log x
sqrt(1-x²)	sqrt(1-(0.1x)²)
lower edge	S	arcsin 0.1x
T	arctan 0.1x

back of slide	LL1	e^0.01x
LL2	e^0.1x
LL3	e^x


outer rotor	L	log x
D	x
inner rotor	C	x
CI	10/x
A	x²
K	x³


upper stock	A	x²
slide	B	x²
CI	10/x
C	x
lower stock	D	x
K	x³

back of slide	S	arcsin 0.01x²
L	log x
T	arctan x


upper stock	A	x²
slide	B	x²
CI	10/x
C	x
lower stock	D	x
K	x³

back of slide	S	arcsin 0.01x²
L	log x
T	arctan x

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1997-08-03 .. 2004-10-17 (+44 7010 700642)