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The "Colliery Guardian" Coalfields Map, giving the lines of Equal Magnetic Declination for January 1, 1914-.

Also the Mines Inspection Districts and principal shipping ports.

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TABLE OF LOCAL CORRECTIONS

TO BE APPLIED TO	THE
MAGNETIC DECLINATION.	
Town	Corrections  Minutes of A  Edinburgh •	-	+4	
Kirkcaldy ...	+ 2
Falkirk ....	+ 16
Hamilton ...	— 1
Glasgow ...	—11
New-Cumnock	— 9
Ayr	....	— 9
Whitehaven ...	+ 7
Maryport .	•	.	0
Wigton ....	+ 2
Berwick-on-Tweed •	-21
Morpeth ...	— 5
Newcastle	— 4
Sunderland ...	—10
Durham ....	— 9
Bishop Auckland -	— 4
Stockton	...	— 1
Guisborcough	•	•	— 2
Leeds ....	— 7
Pontefract ...	+ 6
Huddersfield ...	— 4
Barnsley ...	+ 4
Sheffield	+23
Chesterfield ...	+ 11
Mansfield ...	+ 6
Nottingham •	•	.	— 4
Burnley ....	—11
Rochdale ...	—24
Bolton ....	—11
Wigan ....	— 7
St. Helen’s ...	— 3
Manchester ...	—17
Congleton ...	—13
Stoke-on-Trent •	0
Flint ....	+ 4
Mold ....	+ 3
Wrexham •	•	+ 4
Shrewsbury ...	+ 8
Wellington •	•	+ 8
Rugeley • Wolverhampton •	— 6 -20
Walsall -	.	.	-	—21
Dudley- ....	—20
Birmingham .	•	•	—23
Tamworth ...	+ 10
Atherstone ...	+40 /
Nuneaton ...	+ 14/
Ashby-de-la-Zoudh	—1/
Lydney -	-/s
Bristol ....	T 3
Radstock ...	/ 0
Pontypool ...	/+ 3
Cardiff -	-	-	• /	— 5
Pontypridd - . / Neath - - - /•	~ 6 + 4
Aberdare -	- / -	+ 4
Swansea -	-	— 8
Llanelly -	-	/	.  Haverfordwest /•	—10 ~19
Dover -	. /.	-10
London (Kew) / •	+ 16

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In the above map the EXPOSED COALFIELDS are shewn by blue washes, and the HIDDEN COALFIELDS by blue shade lines ; the boundaries of the MINES INSPECTION DISTRICTS are indicated by strong black lines, and
RAILWAYS are shewn in red. The chief COAL EXPORTING TOWNS are printed in red, and those TOWNS POSSESSING A MINING UNIVERSITY OR COLLEGE approved under the Coal Mines Act 1911, are in black capitals.

The “Newcastle” and “Durham” Inspection Districts have recently been combined to form the Northern Division.

The Isogonals or 1LINES OF EQUAL MAGNETIC DECLINATION are laid down for January 1, 1914. The lines are mean lines, and considerable local deviations are found to exist, particularly in the Birmingham district. For any
case in which ^greater accuracy is required reference should be made to the TABLE OF LOCAL VARIATIONS IN DECLINATION inserted as an inset, which gives the amounts of deviation from the mean values indicated by the
isogonals at a number of places fairly evenly spread over the mining districts. Corrections shewn + are to be added to the Declination as determined from the map and those shewn — are to be subtracted. Corrections for places not
mentioned in the table may be obtained by taking proportional distances from the two nearest towns given. The Magnetic Declination was diminishing at the average annual rate of 9 minutes during 1911—1912, but the diminution was
not uniform for all parts of the Kingdom.