D O C . 2 9 3 O N C E N T E N A R Y O F K E L V I N 4 6 1
Published in Die Naturwissenschaften 12 (1924): 601–602 on 25 July 1924.
William Thomson (1824–1907) was Professor of Physics at the University of Glasgow.
See Thomson 1867. Einstein discussed Thomson’s multiplier and its relation to his own
Maschinchen in his Lecture Notes for Course on Electricity and Magnetism, University of Zurich,
Winter Semester 1910/1911 (Vol. 3, Doc. 11, [p. 28]).
See Thomson 1872. The quantity h in the figure above is the capillary depression measured from
the surface of the fluid.
The constant σ is more commonly known as the surface tension.
See Helmholtz 1858 and Thomson 1869.
The last equality follows from Stokes’s theorem and the fact that the curl of a gradient is identi-