Chapter 12 - Clocks and Associated Devices - Sterilizers (Zeit Einrichtungen): ZE VIChapter 12 - Clocks and Associated Devices - Period Delay Mechanisms (Zahl Kontak): ZK I
GERMAN UNDERWATERS ORDNANCE MINES
Chapter 12 - CLOCKS AND ASSOCIATED DEVICES
PERIOD DELAY MECHANIMS (ZAHL KONTAKT)

All German period delay mechanisms are spring-driven clockwork systems whose es-capements are released by electromagnets. However, the mine-firing unit must be acti-vated before the escapement electromagnet of the period delay mechanism can be ener-gized.