SIM – Plate 34b
Plate 34, Fig. 65, the same experiment carried out between 10 p.m., the 27th September and 2 a.m. the 28th September: The difference between the 21st and the 27th September is very great. But in reality, this is the type of experiment to be expected to happen during the night. In a way, we could say, it returns to normal behaviour. In another direction it shows a stronger Iron activity. The whole background of the picture is vividly ochre coloured; the rising height is identical with the one observed between the 21st and 22nd September. The single arrows are much bigger, but look through a veil of superimposed Iron sulphate. The upper part of the picture is mostly yellow coloured, with faint greyish silver lines passing through.