. Official proceedings . In this case we have another ordinary steel nail connectedup with a piece of metallic copper. Before the plate fromwhich this photograph was taken had stood very long, the re-action had developed sufficiently to show the small piece of cop-per and the platinum wire connecting the two, only as possessedof negative polarity, the dark area surrounding the body of thenail constituting the positive area. The negative area shownat the two ends of the nail were secondary developments, show-ing that a sufficient change had taken place to cause the two€nds to become negative as
. Official proceedings . In this case we have another ordinary steel nail connectedup with a piece of metallic copper. Before the plate fromwhich this photograph was taken had stood very long, the re-action had developed sufficiently to show the small piece of cop-per and the platinum wire connecting the two, only as possessedof negative polarity, the dark area surrounding the body of thenail constituting the positive area. The negative area shownat the two ends of the nail were secondary developments, show-ing that a sufficient change had taken place to cause the two€nds to become negative as against the middle portion positive. 232 (Slide No. lo). You will recall some statements previously made, pertainingto the increased rapidity of corrosion in the presence of oxidesof iron; for example, iron rust. In this picture we have a pieceof ordinary iron rust connected up with another steel nail. Inthe early part of the life of this specimen, the area surroundingthe small piece of iron rust only assumed the negative condi-tion, while the head of the nail assumed a very strong positivecondition, which resulted in the corrosion of the head to theextent shown, as per dark area in cut representing this first no negative indications were shown around any portionof the nail itself, but after the corrosion had taken place on thehead of the nail to practically the extent shown, the point of thenail and an area corresponding to a small part of its lengthbetween its head and its center, assumed a negative most interesting fact in connection with this slide is that thepicture showed these effects during the short period of
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Keywords: ., bookauthorrailwayc, bookcentury1900, bookdecade1900, bookyear1901
