• Description: Schematic of a coastal fortification with a rotating gun turret. Original Swedish caption (a-d): Främre pansaret af gjutstål; Pansarkupol af d:o; Takplåt av järn; Svängningsinrättningen.
• Glossary:
  • a, Outer steel armour.
  • b, Armoured dome.
  • c, Iron roof armour
  • d, Machinery for rotating the turret.

Note: beton means concrete.

• Source: Fröléens konversationslexikon, vol II, p. 510 (Stockholm 1914).

English: This image comes from the Swedish encyclopedia Fröléens konversationslexikon (1910–1914). The copyrights for that book have expired and this image is in the Public Domain. That is because images had no named authors and the book was published more than 70 years ago. Svenska: Denna bild kommer från Fröléens konversationslexikon (1910–1914). Upphovsrätten för det verket har gått ut, och bilderna är fria att använda. Deutsch: Dieses Bild stammt aus Fröléens konversationslexikon (1910–1914). Das Werk ist gemeinfrei.

This work was published before January 1, 1929 and it is anonymous or pseudonymous due to unknown authorship. It is in the public domain in the United States as well as countries and areas where the copyright terms of anonymous or pseudonymous works are 95 years or fewer since publication.