An ogive's rings are not a fixed factor apart

Where the counted pair changes along the specimen. The upper marks are the ladder's prediction from the profile alone; the lower are a blind counter walked up the built lattice. Consecutive gaps are 1.626, 1.631, 1.657, 1.763 — a spread of 8 per cent, where a single exponent would give one number repeated. On a true cone every gap would be 2.618.