Referee report by G. B. Airy on 'On the Present Amount of Westerly Magnetic Declination [Variation of the Compass] on the Coast of Great Britain, and Its Annual Changes' by Captain F. J. Evans

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                                Meridian, and the modes of using them and referring 
them to the Compass, on which the value of the paper 
entirely depends, the information is insufficient.
I think this ought to be given more fully.
3. The writer, in drawing his curves, has drawn 
some assistance from his knowledge of the general course 
of the curves at some distance beyond the British 
Islands. This process frequently would be dangerous,
but I know no person to whose discretion I would trust 
it more completely than Captain Evans.
4. In regard to the mean declination for the year at 
Greenwich, Captain Evans has taken the numbers from 
the Reports to the Board of Visitors. This is not the 
best authority: <s>it<\s> the number is always qualified as “about”. The 
best number is in the Magnetical and Meteorological Observations.
Both are published in the same volume of Greenwich Observations.
5. The results are carried on to 1872 by extrapolation. Captain Evans has considered this, and is 
satisfied that the error is less than other possible errors. I yield, though rather unwillingly, to his conclusion.
6. A curious mistake is made as to the latitude of 
the R. Observatory, which is erroneous by 15”. It is totally 
unimportant here, but when a latitude is given to single 
seconds it ought not to be in error by 15”.
I think that Captain Evans’ attention ought to be called 
to my remarks No’s 2, 4, and <s>5<\s> 6; but I give my unqualified 
recommendation for printing the paper. I am, my dear Sir,
Yours most truly 
G. B. Airy
                            
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Manuscript details

Author
Frederick John Owen Evans
Reference
RR/7/178
Series
RR
Date
1872
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Referee report by G. B. Airy on 'On the Present Amount of Westerly Magnetic Declination [Variation of the Compass] on the Coast of Great Britain, and Its Annual Changes' by Captain F. J. Evans, 1872. From The Royal Society, RR/7/178

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