6.6 Non-Linear and Long-Scale Rules

Two different lengths are indicated in the tables below. First, L0 is the length in inches of a single decade of the main scale (e.g., C, D) on the rule. The second parameter, Lx, is the length in inches of the slide rule’s maximum dimension. Note that the value of L0 for a typical linear slide rule is approximately 10 inches (25 cm). The first list below tabulates all slide rules in the collection that are not linear slide rules (i.e., circular, spiral, and helical slide rules). The second list has any slide rule with L0 greater than the standard 10 inches.

Non-Linear Slide Rules

Maker Model Year Type Mat L0 Lx
Stanley Fuller’s Calculator Model No. 1 1909 H wd 500 12
Gilson Atlas
1931 S Al 468 8
Otis King Model L 1949 H ss 66 6
Otis King Model K 1965 H ss 66 6
Felsenthal AN 5837-1 1943 C pl 60 8
Boykin RotaRule Model 510 1965 S pl 50 6
Sillcocks-Miller M1 Slide Rule No. 547 1942 C pl 31 12
Fowler Long-Scale (RX) 1943 C ss 30 3
Palmer Palmer’s Computing Scale 1843 C pp 27 11
Gilson Binary 1941 C Al 26 9
Kahl Scientific Culbertson Slide Rule 1955 C pl 24 8
Felsenthal FAA-95 1950-1955 C pl 16 8
C-Thru PS-79
1970 C pl 16 6
C-Thru S-96
1973 C pl 15 6
Gilson Midget 1919 C Al 12 4
Gilson Midget
1940 C Al 12 4
Felsenthal D-4 1944 C pl 12 4
Felsenthal Logarithmic Calculator FF-6 1951 C pl 12 5
Concise 270
1955 C pl 12 4
Pickett 101-C 1962-1964 C Al 12 4
Fearns Calculators A13
1970 C pl 12 5
Palmer Palmer’s Pocket Scale 1845 C pp 10 3
Felsenthal Dial-A-Con 1968 C pl 9 7
Concise 600ST 1969 C pl 8 3
Concise 28
1970 C pl 8 4
MATSKU KL-1 1969 C ss 5 2
Blundell Rules Limited Radiac No. 1 1952-1956 C pl 2 5
Concise 380
1959-1966 C pl 2 4

Long-Scale Slide Rules

Maker Model Year Type Mat L0 Lx
Stanley Fuller’s Calculator Model No. 1 1909 H wd 500 12
Gilson Atlas
1931 S Al 468 8
Otis King Model L 1949 H ss 66 6
Otis King Model K 1965 H ss 66 6
Felsenthal AN 5837-1 1943 C pl 60 8
Boykin RotaRule Model 510 1965 S pl 50 6
Pickett N1010-ES Trig Demonstration
1958 L wd 40 48
Sillcocks-Miller M1 Slide Rule No. 547 1942 C pl 31 12
Fowler Long-Scale (RX) 1943 C ss 30 3
Palmer Palmer’s Computing Scale 1843 C pp 27 11
Gilson Binary 1941 C Al 26 9
Kahl Scientific Culbertson Slide Rule 1955 C pl 24 8
K&E 4088-5
1920 L wd 20 20
K&E 4092-5 1923 L wd 20 20
Nestler 24
1930 L wd 20 20
K&E N4096 1935 L wd 20 20
K&E N4092-5 1936 L wd 20 20
K&E N4053-5 1937 L wd 20 20
K&E 4081-5 1956 L wd 20 20
Aristo 1067U 1961 L pl 20 20
Richardson Model of 1917 1917-1918 L wd 17 18
K&E 4083
1916 L wd 16 16
Felsenthal FAA-95 1950-1955 C pl 16 8
C-Thru PS-79
1970 C pl 16 6
C-Thru S-96
1973 C pl 15 6
noID Gunter Rule
1820 L wd 12 24
Dring and Fage Inland Revenue Rule 1883-1902 L wd 12 24
Gilson Midget 1919 C Al 12 4
Gilson Midget
1940 C Al 12 4
noID Engraving Rule
1940 L wd 12 20
Felsenthal D-4 1944 C pl 12 4
Felsenthal Logarithmic Calculator FF-6 1951 C pl 12 5
Concise 270
1955 C pl 12 4
Pickett 101-C 1962-1964 C Al 12 4
Fearns Calculators A13
1970 C pl 12 5
Davies Routledge Engineer
1840 L wd 11 12
E.S.A. London Harrow Mark Reducer 1898-1925 L wd 11 36

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.