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Doc. 200.] 565
CONTROVERSY WITH CELSIUS.
cal enterprizes ever undertaken in the world ; without mention
ing several other projects.
The above I desire to communicate to you with all due
respect. I remain
Your most obedient servant,
EM, SWEDENBORG ,
DOCUMENT 200.
SWEDENBORG’S CONTROVERSY WITH
PROFESSOR ANDERS CELSIUS,14 OF UPSAL,
IN 1740 AND 1741,
This controversy was provoked by a paper which Professor
Celsius read in 1740 before the Academy of Sciences in Stock
holm , in which he communicated the declination of the mag
netic needle for Upsal and Torneå as obtained by his personal
observations, comparing his own results with those produced
by a theoretical computation according to the principles laid
down by Swedenborg in his Principia for the determination
of the declination of the needle for all parts of the globe.
After showing that there was a difference of about eight degrees
between the results obtained by the two different methods,
he closed his paper with these remarks: “ From this it is made
sufficiently clear that some improvement is necessary in the
Assessor’s hypothesis."
Upon his return to Stockholm in 1740, Swedenborg him
self made a computation of the declination of the needle for
Upsal, according to his principles, and communicated the result
to the Academy of Sciences in a paper read before them on
December 14, in which he proves that the difference between
the practical observation made by Professor Celsius and the
theoretical computation according to his principles amounts
to scarcely 1 minute, instead of 8 degrees, 13; minutes, or
4934 minutes.
Professor Celsius, thereupon, in a paper handed in on
January 23, 1741, communicated the computation of Magister
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