Studied from its original page

Hjulström curve

Hjulstrom curve · Hjulstrom diagram

Not shown here: its rights are not cleared

See the original page — Fig. 18, p. 298 (PDF page 78)

Fails both tests: published 1935 is after 1930 (A) and Hjulstrom died in 1982 (B would run to 2052).

The data it needs

Built in 6 steps, as its maker described

Fig. 18, p. 298 (logarithmic); Fig. 17, p. 297 (linear)

Skeleton drawing, not the original plate

13 other forms share this skeleton

Attribution checked against the source