D Some Collection Statistics

Total number of slide rules: 335.

Range of rule ages: 49 to 215 years. Average rule age: 83.1 years.

Number of rules at least 75 years old: 178. Number of rules at least 100 years old: 76.

Number of rules at least 125 years old: 15. Number of rules at least 150 years old: 10.

Countries of the Slide Rule Makers

Country No. Rules Makers
CHN 2 Ruyi, UIF Shanghai
DEN 2 Rietz
EGER 1 Reiss
FRA 2 MARC
GER 42 Aristo, Dennert & Pape, Dietzgen, Faber, Faber-Castell, HH, KHH, Kolesch, Nestler, Staedtler
JPN 46 Alco, Concise, Hemmi, Relay-Ricoh, noID
UK 26 Blundell Rules Limited, Boots Ringplan, Davies, Dring and Fage, E.S.A. London, Fearns Calculators, Fowler, Gill, Halden, Jacob and Halse, Otis King, Stanley London, Thornton, Unique, noID
USA 211 Acu-Rule, American Blueprint, Baetzmann, Belcher Bros., Boykin, Bruning, C-Thru, Charvoz-Roos, Dietzgen, Engineering Instruments, Felsenthal, Festus, Gilson, Goodyear, Graphic Calculator, J.B. Carroll, K&E, Kahl Scientific, Lawrence, Novotni, P.A.S. Co., Palmer, Pickett, Richardson, Sandish, Sillcocks-Miller, Stanley, Sterling, noID
USSR 3 Factory10, MATSKU, USSR Military

Primary Construction Materials

Material No. Rules Makers
Al 38 Gilson, Pickett, Reiss, Richardson
bb 39 Hemmi, Relay-Ricoh
iv 1 Jacob and Halse
Mg 11 Acu-Rule, Pickett
pl 74 Acu-Rule, Aristo, Blundell Rules Limited, Boots Ringplan, Boykin, Bruning, C-Thru, Concise, Dietzgen, Faber-Castell, Fearns Calculators, Felsenthal, Graphic Calculator, J.B. Carroll, K&E, Kahl Scientific, MARC, Novotni, Pickett, Rietz, Ruyi, Sillcocks-Miller, Staedtler, Sterling, Thornton, USSR Military, noID
pp 3 Goodyear, Palmer
ss 11 Alco, Fowler, Halden, MATSKU, Otis King, P.A.S. Co., Richardson
wd 158 Acu-Rule, American Blueprint, Baetzmann, Belcher Bros., Charvoz-Roos, Davies, Dennert & Pape, Dietzgen, Dring and Fage, E.S.A. London, Engineering Instruments, Faber, Faber-Castell, Factory10, Festus, Gill, HH, Hemmi, K&E, KHH, Kolesch, Lawrence, Nestler, Pickett, Richardson, Sandish, Stanley, Stanley London, Thornton, UIF Shanghai, Unique, noID
  • Key: wd (wood), bb (bamboo), pl (plastic), ss (stainless/steel alloy), Al (Aluminum), Mg (Magnesium), iv (ivory), pp (paper)