Graphoplex 680 Reinforced Concrete Calculations

---

Country of manufacture: France,            Date of manufacture: ____
Overall length: 29.0 cm,          Width: 4.6 cm,           Weight: 90.0 gms
Materials: all plastic, small plastic bumpers on back to elevate rule off working surface
Cursor: 4.2 X 4.5 X 0.5 cms; all plastic, slightly magnifying; lines = four hairlines on front, one set into body on back
Scales: 18, extensions on B², b², b, B
Front: 27 cm // L, B³, B² [b², a, b ] B, Armature ω'=μ%b.h, Lever Arm η.h, Stress Ratio R'a:Rb
Back: Instructions (in French) and data
Back of Slide:      [ST, S, T<45°, C]
Gauge Marks: [π, C, ρ_,,, ρ', ρ'', ρ (5730) ]
Condition: C4-C5 (Minimal to normal signs of use)
Came with: Original leather(?) case

---

Slide - Back

---