The main magazines sit forward of insulation and the relatively cooler engine rooms. Hotter boiler rooms lie farther aft, directly beneath the funnels that need to draw air and exhaust efficiently. This sequence reduces heat transfer toward the explosives while avoiding unnecessarily long uptakes. The two-shaft arrangement completes a compact internal plan in which protection and propulsion are designed together. The diagram makes clear that an all-forward battery succeeds only when the rest of the machinery layout supports it.
Notable Point · 44:25-45:02
Nelson's magazine, machinery, and two-shaft sequence
Nelson's diagram sequences magazines, insulation, engines, boilers, funnels, and two shafts to control heat while keeping the machinery plant compact.