D Some Collection Statistics
Total number of slide rules: 294.
Range of rule ages: 49 to 214 years. Average rule age: 81.1 years.
Number of rules at least 75 years old: 156. Number of rules at least 100 years old: 62.
Number of rules at least 125 years old: 11. Number of rules at least 150 years old: 5.
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 | 37 | Aristo, Dennert & Pape, Dietzgen, Faber, Faber-Castell, HH, KHH, Kolesch, Nestler, Staedtler |
JPN | 42 | Alco, Concise, Hemmi, Relay-Ricoh, noID |
UK | 19 | Blundell Rules Limited, Davies, Dring and Fage, E.S.A. London, Fearns Calculators, Fowler, Jacob and Halse, Otis King, Sikes, Stanley, Thornton, Unique, noID |
USA | 187 | 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, Novotni, P.A.S. Co., Palmer, Pickett, Richardson, Sandish, Sillcocks-Miller, Sterling, noID |
USSR | 2 | Factory10, MATSKU |
Primary Construction Materials
Material | No. Rules | Makers |
---|---|---|
Al | 32 | Gilson, Pickett, Reiss, Richardson |
bb | 35 | Hemmi, Relay-Ricoh |
iv | 1 | Jacob and Halse |
Mg | 7 | Acu-Rule, Pickett |
pl | 66 | Acu-Rule, Aristo, Blundell Rules Limited, Boykin, C-Thru, Concise, Dietzgen, Faber-Castell, Fearns Calculators, Felsenthal, J.B. Carroll, K&E, Kahl Scientific, MARC, Novotni, Pickett, Rietz, Ruyi, Sillcocks-Miller, Staedtler, Sterling, Thornton, noID |
pp | 3 | Goodyear, Palmer |
ss | 10 | Alco, Fowler, MATSKU, Otis King, P.A.S. Co., Richardson |
wd | 140 | Acu-Rule, American Blueprint, Baetzmann, Charvoz-Roos, Davies, Dennert & Pape, Dietzgen, Dring and Fage, E.S.A. London, Engineering Instruments, Faber, Faber-Castell, Factory10, Festus, HH, Hemmi, K&E, KHH, Kolesch, Lawrence, Nestler, Pickett, Richardson, Sandish, Sikes, Stanley, Thornton, UIF Shanghai, Unique, noID |
- Key: wd (wood), bb (bamboo), pl (plastic), ss (stainless/steel alloy), Al (Aluminum), Mg (Magnesium), iv (ivory), pp (paper)