Slide rules HOME page COLLECTION 10" RULES UNITED KINGDOM
Make Boots (an English chain of Pharmacists), Made in Japan
Model Ringplan - Precision Log Log
Notes

1. This rule is a simplex rule with a large complement of scales.
2. It has four log log scales, covering 1.001 to 1.01, 1.01 to 1.15, 1.15 to 2.73 (e) and 2.73 to 20000. It also has a BI scale.
3. On the reverse of the slide, the rule has two Tan scales (T1 and T2). The T1 scale covers the normal 5.8° to 45° range and the T2 adds the 45° to 84° 40' range.
4. The rule has "Made in Japan" in a blind stamping on the back.
Front view
1016-bootspll-01.jpg (29731 bytes)
Detail -left front
1016-bootspll-02.jpg (17637 bytes)		 Detail - left back
1016-bootspll-03.jpg (13572 bytes)
Manufacturing date c 1970
Length 10"
Material Plastic
Scales LL3,LL2,LL1,A[B,BI,CI,C/T2,T1,L,S] D,DI,K, LL0
Gauge points p: 3.14: A,B,C,D
r' : 3438 : C,D
r" : 206255 : C,D
c : 1.13: C,D
r0: 5.74:C,D
Cursor Plastic
Hair lines 1