QUANTIZATION IN SPACE 
89 
vi. 3] 
3. Later Experiments 
Recently experiments have been carried out in America by 
J. B. Taylor.* * * § He has modified the apparatus of Gerlach and 
Stern so as to be able to determine the magnetic moments of 
sodium and potassium atoms. He first repeated the experiment 
of Stern and Gerlach for silver atoms, using a silver-plated 
tungsten coil heated electrically as a source of the atoms instead 
of the furnace employed by the first experimenters. This 
simplified the procedure as there is considerable difficulty in 
ridding the furnace of gas. The slits employed were too wide to 
show more than a decided broadening of the image with a trace 
of division in some of the plates. In the experiments on sodium 
and potassium the slits were made narrower (0-03 mm.). 
“ The metals were evaporated into the apparatus at 345 0 C. 
and 245 0 C. respectively, and the images formed by the deposition 
of the atomic rays on cool glass strips were rendered visible by 
immersing the strips in hydrochloric acid gas, whereupon films 
of opaque chloride were formed. Both metals were found to 
possess an atomic moment of one Bohr magneton, within the 
limits of experimental error, which were about ten per cent.” 
The question as to whether molecules as a whole assume 
quantum orientations in a magnetic field has been brought into 
prominence by the experiments of Glaser, f Although the so- 
called Glaser anomaly has not been confirmed by later experi 
menters, some reference to the question seems called for. He 
investigated the magnetic susceptibility of the gases hydrogen, 
nitrogen and carbon dioxide at low pressures by means of a 
very sensitive form of Curie balance. On the classical theory 
the susceptibility should be proportional to the pressure of the 
gas. This was not in agreement with the experiments. Glaser 
suggested that his results, which cannot be explained by the 
classical theory, depend on the relative values of the times taken 
by the molecules to turn in the direction of the field and the 
times between molecular collisions, the ratio between these 
two times depending on the pressures and fields employed. 
On the other hand Lehrer $ has found proportionality between 
volume susceptibility and pressure both for carbon dioxide and 
for argon ; Hammar § finds no evidence of a magnetic anomaly, 
though with imperfectly dried gases he obtains curves not unlike 
those of Glaser. 
* Taylor, Phys. Rev., vol. 28, p. 576, 1926. 
t Glaser, Ann. d. Physik, vol. 75, p. 459» 1924. 
% Lehrer, Zeits. f. Physik, vol. 37, p. 155, 1926 ; Ann. d. Physik, 
vol. 81, p. 229, 1926. 
§ Hammar, Proc. Nat. Acad. Sci., vol. 12, p. 594, 1926.