Definition of photography
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Magnesium ::
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..
Picture ::
Picture (n.) A
representation of
anything (as a
person, a
landscape, a
building) upon
canvas, paper, or other
surface, produced by means of
painting, drawing, engraving, photography, etc.; a
representation in
colors. By
extension, a
figure; a
model..