Page:ASC 1862 09 17 10-43.pdf/1

Royal Observatory, GreenwichLondon SE
1862 September 17
Dear SirI enclose herewith
the photographs of magnetic
declination and horizontal
force for July 5, 6, 7.
I am, dear Sir,Yours faithfully
G B Airy
Al Rev.do Padre Secchi
The zeros of the curves have been
prepared only within the last two days.
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