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. |