1. This rule is made of tin plate.
2. The provisional patent is dated to 1917 by P Hopp. This would suggest that it is of a
similar age to the unnamed British tin plate rule.
3. The cursor is missing.
| Slide rules HOME page | COLLECTION | 10" RULES | U.S.A. |
| Make | Richardson, USA |
| 1776 | |
| Notes 1. This rule is made of tin plate. |
|
| Front view |
|
| Detail - front left |
|
| Manufacturing date | c 1920 |
| Length | 10" |
| Material | Tin plate |
| Scales | K, S, A[B, CI, C] D, T, L |
| Cursor | Missing |
| Hair lines | None |
| Documentation | None |
| Condition | Good condition if a bit dirty. |