Communication Systems

Portable Mining Magneto Telephone

Portable Mining Magneto Telephone. A Portable Mining Magneto Telephone. Made by Ericsson. Type N-1834. Made from Mahogany Wood and Iron. Size 12″ x 7″ x 5″ inches. This telephone unit has an Ever Ready 3 volt battery incorporated into the back of the unit and a detachable winding key that can be inserted into the body through a covered hole ... Read More »

Portable Mining Magneto Telephone

Portable Mining Magneto Telephone. A Portable Mining Magneto Telephone. Made by Ericsson. Type N-1846. Made from Tin and Bakelite. Size 10″ x 6″ x 5″ inches. This telephone unit has its winding key integrated into the body. Dated 1948. Read More »

Colliery Tannoy – D.A.C.

Colliery Tannoy – D.A.C. Colliery Tannoy – D.A.C. Armoured Colliery Tannoy. Stedfast Electrical Controls Ltd. Hucknall, Nottingham, England. Model SA-1. Made from Iron, Rubber and Brass. Size 10″ X 7″ X 6″ inches. Date 1970s-1980s. These Tannoys were located at all major transfer points, headings and coal faces etc and used for communication between such places and the surface Control ... Read More »

Colliery Tannoy – D.A.C.

Colliery Tannoy. Armoured Colliery Tannoy. Commonly known as a DAC.┬áMini-Amp type BMA. Derby Automation Consultants Ltd, Burton-On-Trent, Staffs. Made from Iron, Rubber and Brass. Size 11″ x 7″ x 6″ inches. Date 1970s-1980s. These Tannoys were placed at all major transfer points, headings and coal faces etc and used for communication between such places and the surface Control Room. Read More »

Colliery Tannoy – D.A.C.

Colliery Tannoy. Armoured Colliery Tannoy. Commonly known as a DAC. Mini-Amp type MA/MI. Derby Automation Consultants Ltd, Burton-On-Trent, Staffs. Made from Iron, Rubber and Brass. Size 9 1/2″ x 4″ x 6″ inches. Date 1980s-1990s. These Tannoys were placed at all major transfer points, headings and coal faces etc and used for communication between such places and the surface. Control ... Read More »

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