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Mine Exploration Forum

Author Mine telephones?
NickPeak

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Joined: 16/08/2010
Location: Derbyshire

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Mine telephones?
Posted: 16/09/2010 19:33:31
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The Peak District Mining Museum has recently acquired a few industrial telephone units made by Plessey. They have a hard black heavy-duty non-metallic case, with lugs for wall mounting, containing handset, dial and magneto, but do not appear to have any safety certification.
There is a plate showing the following (sorry I don't have a picture):

Plessey Telecoms Ltd
Auto/Magneto, Auto
Magneto Telephone
668/1/00005 TYPE
CODE 668/1/00252/002
(Plessey symbol) M&Q SIG APP No 52

Does anyone recognise this? Could 'M&Q' mean 'mines & quarries'? Do they need an external power source? Could we easily rig up a pair at the museum?
IP: 93.97.126.165
Morlock

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Joined: 31/07/2008

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Mine telephones?
Posted: 16/09/2010 23:11:30
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NickPeak wrote:

Could we easily rig up a pair at the museum?


As far as I can gather the magneto only supplies power for ringing the other 'phone but requires a cell or battery for speech transmission.
IP: 82.31.16.44
derrickman

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Joined: 18/02/2009

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Mine telephones?
Posted: 17/09/2010 04:41:32
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most mine phones and tannoys are self-contained affairs with no other cabling, mainly for gas-proofing reasons. There are versions which can be plugged into external power supplies to keep the battery permanently charged up, you sometimes see these in civil engineering tunnelling where gas is not an issue. IP: 212.58.194.50
staffordshirechina

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Joined: 15/11/2009
Location: North Staffordshire

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Mine telephones?
Posted: 17/09/2010 08:40:01
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There are piles of those phones at Magpie.
Ask PDMHS members Andy Gillings or Mike Luff about wiring.
They are both colliery electrical engineers and did the wiring for Temple mine.
As I understand them, those phones require an internal battery for speech and the magneto for ringing. There is already an iron mine phone in the museum that uses the same principle and can be directly connected to those more modern black ones.

Les
IP: 95.148.27.234
Graigfawr

Joined: 04/11/2009

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Mine telephones?
Posted: 17/09/2010 19:17:05
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NickPeak wrote:

The Peak District Mining Museum has recently acquired a few industrial telephone units made by Plessey. They have a hard black heavy-duty non-metallic case, with lugs for wall mounting, containing handset, dial and magneto, but do not appear to have any safety certification.
There is a plate showing the following (sorry I don't have a picture):

Plessey Telecoms Ltd
Auto/Magneto, Auto
Magneto Telephone
668/1/00005 TYPE
CODE 668/1/00252/002
(Plessey symbol) M&Q SIG APP No 52

Does anyone recognise this? Could 'M&Q' mean 'mines & quarries'? Do they need an external power source? Could we easily rig up a pair at the museum?


Yes, 'M&Q' stands for Mines & Quarries; the 'App. No. 52' indicates the official approval certificate number for this model of equipment. Somewhere in HSE archives should be the approval certificate, details of tests, etc.
IP: 92.27.40.6
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