Portal de Periódicos da CAPES

Regarding the magnetic effects of the total solar eclipse of August 30, 1905

1908; Volume: 13; Issue: 2 Linguagem: Inglês

10.1029/te013i002p00076

2379-5697

Ch. Nordmann,

Solar and Space Plasma Dynamics

I am pleased that Mr. Chree's remarks on the subject of my article in this Journal (March, 1907) afford me the opportunity of returning to this interesting question, and I beg to make the following observations: 1. In the table on p. 20 ( loc. cil .) I give for various stations the differences at each instant observed between the force which at each station tends to draw the needle to the east and the value of this same force at Philippeville. I give the values of the forces in terms of 0.1 of my unit which is equal to 0.14γ. Mr. Chree assumes that I guarantee the exactness of these values to the nearest 0.1 of this unit; one will find nowhere in my article any such contention. I have measured, as is usual, the ordinates of the various curves of declination to the nearest 0.1 mm., next, as I have indicated ( loc. cit. p. 19), and in order to make all of the curves comparable one with the other, I have multiplied respectively the ordinates by the proper factors in such manner, if I may thus express myself, “as to reduce them to the same horizontal component”. Now these factors reduced for the times from the values of H for the different stations and from the angular values of the curves in millimeters are none of them integral numbers, but fractional. I have thus naturally given the values of the table in question to the nearest 0.1 of my unit; as it is always the custom in like cases, I have not felt authorized to drop the last decimal which results from the measures and calculations for the different times for fear of introducing new errors.