This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... CHAPTER XIII. CHEMICALS EMPLOYED IN PHOTOGRAPHY (CONTINUED). Iodine. Symbol, I: Combining weight, 127. The elementary body iodine was discovered by Cuurtois, at Paris, in 1812. IIe obtained it from kelp--the ashes of certain seaweeds which contain the iodides of sodium and magnesium. Iodine is ...

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