A.W. Faber-Castell 67
The 67 pattern slide rule family by A.W. Faber-Castell is a series of pocket size slide rules starting in the fifties. It contains several variations of layout including revisions over time.
| Type | Slide Rule (Pocket) |
|---|---|
| Manufacturer | A.W. Faber-Castell |
| Introduced | C. 1955 |
| Successor | 67/54 B Darmstadt |
| Calculator | |
| Precision | 2 to 3 Significant Digits |
| Display type | Analogue Scales, Sliding Cursor (multiple hairlines) |
| Display size | 5" (pocket) |
| Programming | |
| Other | |
| Dimensions | 15 cm (approx. 6") |
| Manufacturer | A.W. Faber-Castell |
|---|---|
| Introduced | C. 1955 |
| Successor | 67/87 b Rietz |
| Calculator | |
| Precision | 2 to 3 Significant Digits |
| Display type | Analogue Scales, Sliding Cursor (multiple hairlines) |
| Display size | 5" (pocket) |
| Programming | |
| Other | |
| Dimensions | 15 cm (approx. 6") |
Overview[edit | edit source]
The 67 pattern of slide rule is a line of simplex rules in several layouts. They are characterized by being made of "Geroplast" plastic, with scales engraved into the plastic. Most sported scale extensions on the C and D scales, with many having extensions on the A and B scales as well. Most members also sported multiple hairlines on their cursor, which facilitated quick calculations and single-setting options for common operations.
R Model Variants[edit | edit source]
For most of the available models, the blank space on the back gave enough room to fit a six digit Addiator adding machine, along with various references and conversions. For all models with an R variant available, the adjustments to the layout will be described.
67/54 Darmstadt[edit | edit source]
The model 54 Darmstadt was a pocket version of the highly popular Darmstadt layout. It sported a cursor with at least two secondary hairlines which helped with finding the area of circles with known diameter, among other things. Faber-Castell marketed this model towards physicists, engineers, mathematicians, and university students.
Layout[edit | edit source]
the model 54 was an archetypal Darmstadt layout, typical of most simplex slide rules with this designation. Notable in this layout are the inclusion of a P scale and a lack of an ST scale, as well as the inclusion of LL scales, which is unusual for a simplex rule.
Front[edit | edit source]
in. L K A (B CI C) D P S T
Back[edit | edit source]
(LL1 LL2 LL3)
Note that this is a simplex rule. All scales on the back are used by inverting the slide, which limits some operations. The later 54 B model added windows to the back which allowed for use without inverting the slide.
R Model[edit | edit source]
the 67/54 R Darmstadt made no layout changes for accommodating the Addiator on the back. The RB model had no rear window for LL scale use without inverting the slide.
67/87 Rietz[edit | edit source]
The model 87 Rietz was consistent with layouts seen more typically in the US.