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COLLECTED PHYSICAL PAPERS
287
movement of the galvanometer spot. At N1 there was no movement, but there was an upward movement of
Fig. 73. Electro-molecular Explorer.
response when the explorer came over the stimulated area "Carbonate." As the explorer passed on to N2 there was a cessation of movement, but when it reached the depressed area marked "Oxalic" there was a vigorous movement downwards (fig. 73).
Interference Effects
I have already described a case of interference in the galvanometric effect when the two points A and B in similar molecular conditions are simultaneously acted on by the same mechanical stimulus. Under these
