7.8 Non-Linear and Long-Scale Rules

The Length presented in the tables below is the total integrated length (in inches) of the main scale (e.g., C, D) on the rule. The length of a typical linear slide rule is approximately 10 inches (25 cm). The first list below tabulates all circular, spiral, and helical slide rules in the collection. The second list has any slide rule with Length greater than the standard 10 inches.

Non-Linear Slide Rules

Maker Model Year Type Mat Length
Stanley Fuller’s Calculator Model No. 1 1909 H wd 500
Gilson Atlas
1931 S Al 468
Otis King Model L 1949 H ss 66
Otis King Model K 1965 H ss 66
Boykin RotaRule Model 510 1965 S pl 50
Fowler Long-Scale (RX) 1943 C ss 30
Gilson Binary 1941 C Al 26
C-Thru S-96
1973 C pl 15
Gilson Midget 1919 C Al 12
Gilson Midget
1940 C Al 12
Fearns Calculators A13
1970 C pl 12
Concise 600ST 1969 C pl 8
Concise 28
1970 C pl 8
MATSKU KL-1 1969 C ss 5
Blundell Rules Limited Radiac No. 1 1952-1956 C pl 2
Concise 380
1959-1966 C pl 2

Long-Scale Slide Rules

Maker Model Year Type Mat Length
Stanley Fuller’s Calculator Model No. 1 1909 H wd 500
Gilson Atlas
1931 S Al 468
Otis King Model L 1949 H ss 66
Otis King Model K 1965 H ss 66
Boykin RotaRule Model 510 1965 S pl 50
Pickett N1010-ES Trig Demonstration
1960 L wd 40
Fowler Long-Scale (RX) 1943 C ss 30
Gilson Binary 1941 C Al 26
K&E 4088-5
1920 L wd 20
Nestler 24
1930 L wd 20
K&E N4092-5 1936 L wd 20
K&E N4053-5 1937 L wd 20
K&E N4096 1950 L wd 20
Aristo 1067U 1961 L pl 20
K&E 4083
1916 L wd 16
C-Thru S-96
1973 C pl 15
Gilson Midget 1919 C Al 12
Gilson Midget
1940 C Al 12
noID Engraving Rule
1960 L wd 12
Fearns Calculators A13
1970 C pl 12
Davies Routledge Engineer
1825 L wd 11

Note: The Fowler Long Scale Calculator is a segmented-scale rule with major scale made up of 6 individual circular scales totaling 30 inches in length.