Volume Doubling Ruler

The Volume Doubling Ruler measures objects defined by a circle or sphere for comparison over time and between similarly shaped objects, in Doubling Number Units, n30 = 1 cc, from 0.016 cc (n24) to 4096 cc (n42) (over 4 liters), or an 18-fold change in Volume Doubling number, over a 250,000-fold change in volume. Small volumes (<n30) read by edge of cursor, over n30 from red drop line as in a slide rule.