Generator thrown solder
You probably have heard of the Model A generator getting too hot and actually melting the solder on the armature. If you haven't seen it yet, here are two photos of what happens. On the first photo there is a silver colored line on the inside of the case just above the field coils and on the edge of the cut away openings. That is the where the melted solder from the hot, spinning armature landed. In the second photo it shows the voids where the solder used to be holding the wires to the commutator bars.
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