Report upon a letter addressed by the Baron de Humboldt to HRH the President of the Royal Society and communicated by HRH to the Council

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                                8

To H. R. H. the President and Council of the Royal Society

Report upon a Letter addressed by M. le Baron 
de Humboldt to H. R. H. the President of the Royal
Society, and communicated by H.RH. to the
Council.

Previously to offering my opinon on the important
communication on which we have been called upon
to report, we feel that it will be proper to lay before
the Council a full account of the communication 
itself. In this letter M. de Humboldt developes a plan
for the observation of the phenomena of Terrestrial
Magnetism worthy of the great and philosophic mind
whence it has emanated, and one from which may
anticipated the establishment of the theory of these 
phenomena.

After his return from the equinoctial
regions of America M de Humboldt, in the years 
1806 and 1807, entered upon a careful and minute
examination of the course of the diurnal variation of
the needle. He was struck, he informs us, in verifying
the ordinary regularity of the nocturnal period, 
with the frequency of perturbations and, above all, of
those oscillations, exceeding the divisions of his scale,
which were repeated frequently at the same hour before 
sunrise. These eccentricities of the needle, of which
a certain periodicity has been confirmed by M. 
Kupffer, appeared to M. de Humboldt to be the
effect of a reaction from the interior towards the 
surface of the globe - he ventures to say, of "<u>mag-
netic storms</u>" - which indicated a rapid change
of tension. From that time he was anxious to
establish
                            
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Manuscript details

Reference
AP/20/8
Series
AP
Date
1836
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Report upon a letter addressed by the Baron de Humboldt to HRH the President of the Royal Society and communicated by HRH to the Council, 1836. From The Royal Society, AP/20/8

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