D Some Collection Statistics
Total number of slide rules: 321.
Range of rule ages: 48 to 214 years. Average rule age: 82.1 years.
Number of rules at least 75 years old: 168. Number of rules at least 100 years old: 71.
Number of rules at least 125 years old: 15. Number of rules at least 150 years old: 9.
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 | 40 | Aristo, Dennert & Pape, Dietzgen, Faber, Faber-Castell, HH, KHH, Kolesch, Nestler, Staedtler |
| JPN | 45 | Alco, Concise, Hemmi, Relay-Ricoh, noID |
| UK | 24 | Blundell Rules Limited, Davies, Dring and Fage, E.S.A. London, Fearns Calculators, Fowler, Gill, Jacob and Halse, Otis King, Stanley London, Thornton, Unique, noID |
| USA | 202 | Acu-Rule, American Blueprint, Baetzmann, Boykin, 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 | 38 | Hemmi, Relay-Ricoh |
| iv | 1 | Jacob and Halse |
| Mg | 8 | Acu-Rule, Pickett |
| pl | 70 | Acu-Rule, Aristo, Blundell Rules Limited, Boykin, 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 | 10 | Alco, Fowler, MATSKU, Otis King, P.A.S. Co., Richardson |
| wd | 153 | 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, 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)