I am a keeper of the soft iron of the air, and a dweller in the light of day. I was f

I was exposed to the air, and I became hard; but I was immediately plunged into water, and I became soft. I was afterwards exposed to the air

I am an English keeper of soft iron, and a permanent magnet. I keep soft iron from becoming a permanent magnet, but I cannot keep myself from becoming a soft iron keeper of…