| Table III Long Scale Devices with Gunter Lines, Gridirons and Graphical Charts & Tables | |||||
|---|---|---|---|---|---|
| Gridiron Scales | |||||
| Maker | Model No./Type | Sections | Approx Date | Effective Scale Length (cm) |
Data Source |
| Tianjian | 510 | ? | FanHsiu Chang The last image is a pdf which discusses the rule | ||
