D Some Collection Statistics

Total number of slide rules: 378.

Range of rule ages: 50 to 216 years. Average rule age: 83.8 years.

Number of rules at least 75 years old: 210. Number of rules at least 100 years old: 90.

Number of rules at least 125 years old: 18. Number of rules at least 150 years old: 11.

Number of rules at least 175 years old: 10. Number of rules at least 200 years old: 5.

Countries of the Slide Rule Makers

Country No. Rules Makers
AUS 1 W&G
CHN 2 Ruyi, UIF Shanghai
DEN 2 Rietz
EGER 1 Reiss
FRA 5 MARC, Tavernier-Gravet
GER 44 Aristo, Dennert & Pape, Dietzgen, Faber, Faber-Castell, HH, KHH, Kolesch, Nestler, Staedtler
JPN 48 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 246 Acu-Rule, American Blueprint, Baetzmann, Belcher Bros., Boykin, Bruning, C-Thru, Charvoz-Roos, Dietzgen, Engineering Instruments, Felsenthal, Festus, General Luminescent Corp, Gilson, Goodyear, Graphic Calculator, Gurley, J.B. Carroll, K&E, Kahl Scientific, Kutz, Lawrence, Mims, Novotni, P.A.S. Co., Palmer, Parisian Novelty, Pickett, Richardson, Sandish, Scofield, Sillcocks-Miller, Simplified Flight Calculator Co., Stanley, Sterling, The American Art Works, USA Mil, noID
USSR 3 Factory10, MATSKU, USSR Military

Primary Construction Materials

Material No. Rules Makers
Al 54 Gilson, Pickett, Reiss, Richardson
bb 41 Hemmi, Relay-Ricoh
iv 1 Jacob and Halse
Mg 11 Acu-Rule, Pickett
pl 85 Acu-Rule, Aristo, Blundell Rules Limited, Boots Ringplan, Boykin, Bruning, C-Thru, Concise, Dietzgen, Faber-Castell, Fearns Calculators, Felsenthal, General Luminescent Corp, Graphic Calculator, Gurley, J.B. Carroll, K&E, Kahl Scientific, MARC, Mims, Novotni, Parisian Novelty, Pickett, Rietz, Ruyi, Sillcocks-Miller, Simplified Flight Calculator Co., Staedtler, Sterling, The American Art Works, Thornton, USA Mil, USSR Military, noID
pp 3 Goodyear, Palmer
ss 11 Alco, Fowler, Halden, MATSKU, Otis King, P.A.S. Co., Richardson
wd 172 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, Kutz, Lawrence, Nestler, Pickett, Richardson, Sandish, Scofield, Stanley, Stanley London, Tavernier-Gravet, Thornton, UIF Shanghai, Unique, W&G, noID
  • Key: wd (wood), bb (bamboo), pl (plastic), ss (stainless/steel alloy), Al (Aluminum), Mg (Magnesium), iv (ivory), pp (paper)