Manufacturer: Dietzgen (Gilson)
Country of Manufacture: U.S.A.
Type: Binary Circular
Date of Manufacture: 1940+
Scales: (Front) C, CI, A, K, L, 4 rev LL, Binary, Fractions,Drill size and mm conversion
Scales: (Back) ( Degrees, Sine, Tangent ) * 3, Fractions-Decimal Equivalents
Number of Scales: 21
Gauge Points: π, q
Slide Rule made from: Aluminium
Cursor made from: Plastic. Two on front, 1 on back
Cursor Lines: 1 on each cursor
Overall Length of Rule: Diameter 21 cm
Length of Scales:  
Depth: 0.2 cm
Weight: 135 gm
Acquired from: Peter O'Brien
Date: Sept 2000
Condition: Good
 Plastic case. Good condition
 Instructions (English). Good condition
 Re-badged Gilson Binary Circular Type 2
 Two major articles on Gilson Circular Rules,
 JOS Vol 9 No 1, JOS Vol 9 No 2