OP 1673A - German Underwater Ordnance; Chapter 4 - Contact and Moored Influence Mines: Base Plates: Table of Contact Mines

GERMAN UNDERWATERS ORDNANCE MINES

Chapter 4 - CONTACT AND MOORED INFLUENCE MINES

TABLE OF CONTACT MINES

Figure 50 – Contact Mines - Table of Data

Designation	Stage of Development	Type	Method of Laying	Method of Firing	Wt. of Charge (pounds)	Case Material	Dimensions		Total wt.	Remarks
Designation	Stage of Development	Type	Method of Laying	Method of Firing	Wt. of Charge (pounds)	Case Material	Diam.	Lenght	Total wt.	Remarks
BMC	Operational	Moored	Aircraft	Le-Clanche horn	120	Steel	26	44	1430	Developed by SVK for use be the Luftwaffe. Is only SVK mine in which booster and detonator are married prior to laying.
BMC/S	Operational	Moored	Surface	Le-Clanche horn	120	Steel	26	44	1430	Same as BMC/S but for laying by E-boat.
EMA	Operational	Moored	Surface & submarine	Chemical horn	330	Steel	34	46	2000	A World War I mine which existed ton two models, one for laying by surface craft and the other by special vertical-shaft U-boats. Stocks of the surface- laid model which remained on hand in 1939 were laid during World War II.
EMB	Operational	Moored	Surface & submarine	Chemical horn	480	Steel	34	46	2200	Same as EMA except for weight of charge.
EMC I	Operational	Moored	Surface	Chemical horn	660	Steel	46	48	2375	This was the standard contact mine, and it was it very wide use in the various forms listed.
EMC II	Operational	Moored	Surface	Chemical horn lower and upper antenna	660	Steel	46	48	2400	Differs from Model I by use of upper and lower antenna and improvements to base plate.
EMC II (Tombac Tubing)	Operational	Moored	Surface	Chemical horn and tombac tub- ing	550 to 660	Steel	46	48	2500	Tombac tubing added to mooring cable to provide protection against sub- marines and to act as anti-sweep device.
EMC II (Lower An- tenna)	Operational	Moored	Surface	Chemical horn and lower an- tenna	550 to 660	Steel	46	48	2400	This was first type of EMC since to which ZE II (80-day clock) scuttling clock was fitted.
EMC II (Cork-Floated Upper Antenna)	Operational	Moored	Surface	Chemical horn and antenna	630 to 660	Steel	46	48	2400	Development to defend against shallow-craft vessels such as PT-boats.
EMC II (Chain Mooring)	Operational	Moored	Surface	Chemical horn	550	Steel	46	48	2500	Utilizes 18-foot length of 16-mm chain as anti-sweep device.
EMC II (Snag- line and Chain Mooring)	Operational	Moored	Surface	Chemical horn	550	Steel	46	48	2500	Developed to defend against shallow-craft vessels.
EMD I/III	Operational	Moored	Surface	Chemical horn	330	Steel	40	40	2100	Developed at same as EMC but intended for use against surface craft only. Consequently it had no lower horns. Is similar in all other respects to EMC except for size.
EMG	Operational	Moored	Surface	Chemical horn	660	Steel	46	48	2680	A constand-depth assembly designed to protect against shallow-craft vessels. Uses EMC case, float, and special ballast weight.
EMK	Operational	Moored	Surface	Chemical horn and/or influe- nce unit	660	Steel	48	50	Unknown	This mine was first attempt to develop a moored mine radically different from the EMC.
Designation	Stage of Development	Type	Method of Laying	Method of Firing	Wt. of Charge (pounds)	Case Material	Dimensions		Total wt.	Remarks
Designation	Stage of Development	Type	Method of Laying	Method of Firing	Wt. of Charge (pounds)	Case Material	Diam.	Lenght	Total wt.	Remarks
EMS I	Operational	Drifting	Surface or submarine	Switch horn	30	Steel	15	75	100	Utilized a floation chamber made to resemble a periscope.
EMS II	Operational	Drifting	Surface or submarine	Switch horn	30	Steel	15	30	65	Same as Model I but a camouflaged float used in place or "periscope".
EMS III	Operational	Drifting	Surface or submarine	Switch horn	30	Steel	15	40	80	Same as Model I but plexi-glass float used in place of "periscope".
EMU	Development	Moored	Surface	Chemical horn and/or influ- ence unit	220	Steel	40	45	Unknown	Smaller model of EMK
FMA	Abandoned	Moored	Surface	Chemical horn	22	Steel	23	25	Unknown	Developed about 1920 for use in Baltic; abandoned in favor of FMB.
FMB	Operational	Moored	Surface	Chemical horn	30 or 44	Steel	26	29	600	Primarily intended for use in shallow waters of Baltic. Uses preset-type anchor.
FMC	Operational	Moored	Surface	Chemical horn	88	Steel	30	33	920	Similar to FMC except for size. Utilizes normal plummet-type anchor.
KMA	Operational	Ground	Surface	Chemical horn	165	Concete	47	47	2200	Intended to defend against landing barges.
OMA I	Operational	Surface	Surface	Chemical horn	66	Steel	42	41	2380	Only mine specially designed for watching on surface.
OMA/K	Operational	Surface	Surface	Chemical horn	66	Steel	42	41	2380	Same as OMA I except for type of mooring used.
OMA II	Abandoned	---	---	---	---	---	---	---	---	Intended to be same as OMA I but with a mechanical disarming device added.
OMA III	Abandoned	---	---	---	---	---	---	---	---	Intended to be same as OMA I but with a electrical disarming device added.
OMA IV	Development	---	---	---	---	---	---	---	---	A special assembly for use in depths up to 925 ft.
UMA	Operational	Moored	Surface	Chemical horn & switch horn	66	Steel	29	29	1800	Manufacture of this mine was halted prior to 1940, the UMB being considered more suitable. Stocks on hand were laid during World War II. Uses preset-type anchor.
UMB (Tom- bac Tubing)	Operational	Moored	Surface	Chemical horn & switch horn	88	Steel	33	33	1400	Replaced UMA. Uses normal plummet-type anchor.
UMB (Chain & Cutter)	Operational	Moored	Surface	Chemical horn & switch horn	88	Steel	33	33	1400	Differs only in type of mooring used.
UMB (Snag Line, Chain & Cutter)	Operational	Moored	Surface	Chemical horn & switch horn	88	Steel	33	33	1400	Snag line added to defend against shallow-drift vessels.
UMB (Chain & Two Cutters)	Operational	Moored	Surface	Chemical horn & switch horn	88	Steel	33	33	1400	One cutter mounted high and one deep.