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ALS signed “M. Faraday,” one page both sides, 4.5 x 7.25, June 2, 1843. Addressed from the “Royal Institution,” a handwritten letter to John Hennell, in full: “The water you describe must I conclude be very hard principally from Carbonate of lime. I do not remember what Lepuantes Patent filter is but filtration if quick might do but little separating only a little of the lime & if slow would probably not block up the filter in a few months or a twelvemonth. Boiling you say produces a dark scum. I should have expected rather a fine white or brownish. Boiling ought to make it softer and filtering after boiling ought to make it good. With my best remembrance to Mrs. Hennell.” Faraday adds a postscript: “I have no other address in your letter than County. I hope that will lead to our mistake.” In fine condition, with a few light paperclip impressions to the top edge.
In the 1840s, at the time of this letter, Michael Faraday was delving into the mysteries of what he would call diamagnetism. Faraday discovered that many materials exhibit a weak repulsion from a magnetic field, a phenomenon he named diamagnetism. Ultimately his research would lead to new perspectives which would result in the classic field theory. Michael Faraday is highly respected and greatly admired; Einstein was said to keep a photograph of him on his study wall alongside pictures of Isaac Newton and James Clerk Maxwell.
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