Chemical Match Output

Number:22a

Maker:Hemmi Metal Chemistry Rule I
PHOTO

Length: 50 cm

Gauge Marks:

Scales Front: L K A DF = CF CIF CI C = D^oK LL3 LL2 LL1

Scales Back: Chemical Scales

Info: D. Boone Collection
Mentioned in the Paul Ross Hemmi Slide Rule Catalogue Raisonné Part II Rules Without Known Model Numbers.
It is the only specimen of this variant known to Paul Ross. It carries a datecode of "RA." See discussion of Metal-Chemistry Rule II for additional information. Year 1967.