J. M. Engelberts' schematic diagram of a coastal defense network.jpg

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Description	日本語: エンゲルベルツの海防網に関する模式図。地形を活かし、複数の砲台からの射線を交錯させ軍艦の運行に対応するシステム。 English: J. M. Engelberts' schematic diagram of a coastal defense network. A system that utilizes terrain, interweaving lines of fire from multiple batteries to counter the movement of warships.
Date	1839
Source	Proeve eener verhandeling over de kustverdediging
Author	J. M. Engelberts

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