Studied from its original page

Stüve diagram (pseudo-adiabatic chart)

Stuve diagram (pseudo-adiabatic chart) · emagram · aerogram (Refsdal diagram) · Neuhoff pseudo-adiabatic chart

Not shown here: its rights are not cleared

See the original page — Fig. 1c, p. 1-4 (PDF page 16)

Test A passes (US federal government work, 17 USC 105) but test B fails because a government work published in 1979 is far past the 1955 cutoff.

The data it needs

Built in 3 steps, as its maker described

section 1.2, p. 1-1; Figs. 1a-1d, pp. 1-2 to 1-5

Skeleton drawing, not the original plate

18 other forms share this skeleton

Attribution less certain: contested, or no single inventor recorded