Helmholtz’s hand-computed dissonance curve matches modern algorithmic computation

Evidence

As one tone is kept fixed, and the other is raised in frequency, the number and severity of near-frequency collisions changes, and thus the roughness measure changes. Plotting the roughness measure versus frequency of the second tone, we arrive at a figure first sketched by Helmholtz. In fact, although figure 26.6 was computed with an algorithm implementing the pair search and assigning penalties; it looks very much like the one Helmholtz computed by hand in a similar way for his book. — Eric J. Heller, Why You Hear What You Hear- An…, 2338