1. This a fairly comprehensive rule having three log-log and three inverse log-log scales.
LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2
| Slide rules HOME page | COLLECTION | 5" RULES |
| Make | Keuffel and Esser, USA |
| Model | 4181-1 |
| Notes 1. This a fairly comprehensive rule having three log-log and three inverse log-log scales. |
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| Front view |
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| Detail - front left |
Detail -front right |
| Back view |
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| Detail -back left |
Detail - back right |
| Manufacturing date | c 1970 |
| Length | 5" |
| Material | Plastic |
| Scales | LL01, L, K, A [B, T, SRT, S] D,DI, LL1 LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2 |
| Cursor | Plastic with plastic and metal frame |
| Hair lines | Single hair lines |
| Documentation | None |
| Condition | Very good |