General view of the 30.5 cm cannon at Castle of San Carlos. Shells weighing 386 kg left the barrel at a speed of 894 meters per second. The Castle of San Carlos or Castillo de San Carlos, is a fortress built to defend the port of Palma, Spain. Pillow #831074964
General view of the 30.5 cm cannon at Castle of San Carlos. Shells weighing 386 kg left the barrel at a speed of 894 meters per second. The Castle of San Carlos or Castillo de San Carlos, is a fortress built to defend the port of Palma, Spain. Pillow #831074964
