Some Collection Statistics

Total number of slide rules: 272.

Range of rule ages: 48 to 213 years. Average rule age: 79.6 years.

Number of rules at least 75 years old: 139. Number of rules at least 100 years old: 50.

Number of rules at least 125 years old: 5. Number of rules at least 150 years old: 3.

Countries of the Slide Rule Makers

Country No. Rules Makers
CHN 2 Ruyi, UIF Shanghai
DEN 2 Rietz
EGER 1 Reiss
GER 34 Aristo, Dennert & Pape, Dietzgen, Faber, Faber-Castell, HH, KHH, Kolesch, Nestler, Staedtler
JPN 42 Alco, Concise, Hemmi, noID, Relay-Ricoh
UK 17 Blundell Rules Limited, Davies, Dring & Fage, E.S.A. London, Fearns Calculators, Fowler, Jacob and Halse, noID, Otis King, Stanley, Thornton, Unique
USA 170 Acu-Rule, American Blueprint, Baetzmann, Boykin, C-Thru, Charvoz-Roos, Dietzgen, Engineering Instruments, Felsenthal, Festus, Gilson, Goodyear, J.B. Carroll, K&E, Kahl Scientific, Lawrence, noID, Novotni, P.A.S. Co., Pickett, Richardson, Sterling
USSR 2 Factory10, MATSKU

Primary Construction Materials

Material No. Rules Makers
Al 31 Gilson, Pickett, Reiss, Richardson
bb 35 Hemmi, Relay-Ricoh
iv 1 Jacob and Halse
Mg 7 Acu-Rule, Pickett
pl 55 Acu-Rule, Aristo, Blundell Rules Limited, Boykin, C-Thru, Concise, Dietzgen, Faber-Castell, Fearns Calculators, Felsenthal, J.B. Carroll, K&E, Kahl Scientific, MARC, noID, Novotni, Rietz, Ruyi, Staedtler, Sterling, Thornton
pp 1 Goodyear
ss 10 Alco, Fowler, MATSKU, Otis King, P.A.S. Co., Richardson
wd 132 American Blueprint, Baetzmann, Charvoz-Roos, Davies, Dennert & Pape, Dietzgen, Dring & Fage, Engineering Instruments, E.S.A. London, Faber, Faber-Castell, Factory10, Festus, Hemmi, HH, K&E, KHH, Kolesch, Lawrence, Nestler, noID, Pickett, Stanley, Thornton, UIF Shanghai, Unique

A key for the primary material types is found at the bottom of the The Slide Rule Collection.