6.8 Pocket Rules

Sometimes accuracy was not the most important player of the moment, but rather accessibility to the slide rule itself. The list below includes all slide rules in the collection with overall longest dimension less than or equal to 6 inches, assuming that such a device could be placed into a shirt or coat pocket. Both the single-decade length (L0) and the overall largest dimension (Lx) of the slide rule are provided in the table. Approximately 21% of the slide rules in the collection are pocket rules.

Maker Model Year Type Mat L0 Lx
Otis King Model L 1949 H ss 66.0 6.0
Otis King Model K 1965 H ss 66.0 6.0
Boykin RotaRule Model 510 1965 S pl 50.0 6.0
C-Thru PS-79
1970 C pl 16.0 6.0
C-Thru S-96
1973 C pl 15.0 6.0
Graphic Calculator Percentage Calculator 1962 C pl 5.0 6.0
Felsenthal Logarithmic Calculator FF-6 1951 C pl 12.0 5.0
Fearns Calculators A13
1970 C pl 12.0 5.0
Richardson Direct Reading Pocket
1912 L ss 5.0 5.0
Richardson Direct Reading Pocket
1912 L ss 5.0 5.0
KHH Pocket Rule 1919 L wd 5.0 5.0
Faber-Castell 379 1923 L wd 5.0 5.0
K&E 4088-1 1923 L wd 5.0 5.0
MARC promo
1930 L pl 5.0 5.0
MARC promo
1930 L pl 5.0 5.0
Lawrence 10-C 1935-1938 L wd 5.0 5.0
K&E 4097D 1944 L pl 5.0 5.0
K&E 4098A 1944 L wd 5.0 5.0
Charvoz-Roos PSR-105 1944-45 L wd 5.0 5.0
Charvoz-Roos SR-108 1945 L wd 5.0 5.0
Unique 5L/L
1945 L wd 5.0 5.0
Bruning 2401
1947 L pl 5.0 5.0
Bruning 2401
1950 L pl 5.0 5.0
Goodyear promo
1950 L pp 5.0 5.0
Pickett 600 1950 L Mg 5.0 5.0
Faber-Castell 67/54R 1953-1956 L wd 5.0 5.0
Pickett 20-BASIC
1955 L Al 5.0 5.0
K&E 4097C 1957 L wd 5.0 5.0
K&E 4181-1 1957 L pl 5.0 5.0
K&E 4181-1 1957 L pl 5.0 5.0
Pickett N1006-ES 1958-62 L Al 5.0 5.0
Pickett 600-ES 1959 L Al 5.0 5.0
Rietz UTO 601
1960 L pl 5.0 5.0
Rietz UTO 601
1960 L pl 5.0 5.0
Pickett N200-T Trig 1962 L Al 5.0 5.0
Pickett N600-T 1962 L Al 5.0 5.0
Pickett N600-ES
1964 L Al 5.0 5.0
Pickett N600-ES
1964 L Al 5.0 5.0
Hemmi Pocket Versalog 1965 L bb 5.0 5.0
Relay-Ricoh 99-7030
1965 L bb 5.0 5.0
Alco P266
1966 L ss 5.0 5.0
Pickett N3p-T 1966 L Al 5.0 5.0
K&E 68-1130 1967 L pl 5.0 5.0
K&E 68-1130 1967 L pl 5.0 5.0
Hemmi Pocket Versalog 1968 L bb 5.0 5.0
Boots Ringplan Precision Log Log
1970 L pl 5.0 5.0
Sterling 587
1970 L pl 5.0 5.0
noID noID
1970 L pl 5.0 5.0
Dietzgen 1771 1970-1972 L pl 5.0 5.0
Hemmi Pocket Versalog II 1971 L bb 5.0 5.0
Aristo 867U 1972 L pl 5.0 5.0
Dietzgen 1776 1972 L pl 5.0 5.0
Faber-Castell 62/83 1972 L pl 5.0 5.0
Sterling 587 1972 L pl 5.0 5.0
Blundell Rules Limited Radiac No. 1 1952-1956 C pl 2.0 5.0
Gilson Midget 1919 C Al 12.0 4.0
Gilson Midget
1940 C Al 12.0 4.0
Felsenthal D-4 1944 C pl 12.0 4.0
Concise 270
1955 C pl 12.0 4.0
Pickett 101-C 1962-1964 C Al 12.0 4.0
Concise 28
1970 C pl 8.0 4.0
Nestler 41 Pocket
1925 L wd 4.0 4.0
Hemmi 32 1936-43 L bb 4.0 4.0
Hemmi 32 1947-49 L bb 4.0 4.0
Hemmi 32 1957 L bb 4.0 4.0
Hemmi 30 1964 L bb 4.0 4.0
Hemmi 30 1968 L bb 4.0 4.0
Concise 380
1959-1966 C pl 2.0 4.0
Fowler Long-Scale 1943 C ss 30.0 3.0
Palmer Palmer’s Pocket Scale 1845 C pp 10.0 3.0
Concise 600ST 1969 C pl 8.0 3.0
Halden Calculex
1918 C ss 6.3 2.5
MATSKU KL-1 1969 C ss 5.0 2.0