The 1924 and 1934 120 mm mounts elevated only to about 35 and 30 degrees, making them primarily surface-action weapons; the 1924 mounting was also entirely manual. Swedish planners paired these guns with 40 mm Bofors weapons for aircraft at shorter ranges. In a Baltic running fight against surface and air threats together, the lighter guns could take over nearby aircraft while the main battery returned to surface targets. The 1942 twin mounting's 80-degree elevation expanded the main battery's air-defense role after wartime experience exposed the limits of the earlier division.
Notable Point · 35:51-38:28
How Swedish ships divided surface and air targets
Low-angle 120 mm mounts and 40 mm Bofors guns divided the work of a Baltic running fight until the 1942 high-angle mounting expanded the main battery's anti-aircraft role.