The Faraday cup electrometer is the simplest form of an electrical aerosol instrument used in aerosol studies. It consists of an electrometer and a filter inside a Faraday cage. Charged particles collected by the filter generate an electric current which is measured by the electrometer.
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“I write mainly for the kindly race of women. I am their sister, and in no way exempt from their sorrowful lot. I have drank [sic] the cup of their limitations to the dregs, and if my experience can help any sad or doubtful woman to outleap her own shadow, and to stand bravely out in the sunshine to meet her destiny, whatever it may be, I shall have done well; I have not written this book in vain.”
—Amelia E. Barr (1831–1919)