Royal Institution | 12th Feby 1833
My dear Sir
I have made time to examine the deposits. The white substance is almost entirely sulphate of lime. There is no carbonate of lime present and only a trace of insoluble silica & alumina. The sulphate of lime is not anhydrous but that you would probably expect[.] It[s] granular crystalline appearance &c &c you are no doubt aware of[.]
The other deposit that is thin brown scabs consists principally of carbonate if lime but there is also present a little combustible matter. It may have been wax or oil or any thing else[.] It is pretty uniformly diffused through the mass as if it had been mixed up with it originally but I cannot assert that has been the case[.] There is also a fraction (small) of per oxide of iron present[.]
Ever | Dear Sir | Very truly Yours | M. Faraday
Charles Babbage Esq | &c &c &c
Please cite as “Faraday0640,” in Ɛpsilon: The Michael Faraday Collection accessed on