Moore–Spiegel oscillator — thermosolutal / convection chaos (Moore & Spiegel 1966) — dx/dt = y, dy/dt = −y + R z − T x − R x² z, dz/dt = −x. Classic chaotic R=100 T=26. Dual R+T sliders. Bursting convection fold, distinct ODE from Rayleigh–Bénard / Shimizu–Morioka (y, x−λy−xz, −αz+x²) and Hadley (Lorenz 1984). Bulk centroid ≈ (−0.14, −0.65, 0.06) from warm 20k + 80k RK4 @ dt=0.002. Distinct from Rayleigh–Bénard, Hadley, Lorenz-1963, Dequan–Li, Coullet, Burke–Shaw, Sprott–Linz A–S. RK4, not rayleigh-benard.html, not hadley.html, not lorenz.html. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.