C o n t r i b u t i o n
t o   t h e
T h e o r y   o f
F e r r o m a g n e t i s m

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1.
Assumptions

2.
The simple linear chain

3.
The three-dimensional model

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This excerpt of the Hamburg dissertation (1924)
was first published in "Zeitschrift für Physik",
vol. XXXI, 1925 (received on 9 December 1924).

Translated by Jane Ising and Tom Cummings.

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Technical note:
The underlined letters H, J and M represent the same
letters of the original text in Old English letterface.
You should have installed the Symbol font
for getting the greek letters of the text displayed.

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