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The Salt of the World?
- Photography - n. - The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like.
- Photography - n. - The art or process of producing pictures by this action of light.
- Magnesium - n. - A light silver-white metallic element, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75.
- Magnetograph - n. - An automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements.
- Pyrogallol - n. - A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.
- Astrophotography - n. - The application of photography to the delineation of the sun, moon, and stars.