A mammoth plate is a photographic plate that is usually 18 x 21 inches, but may vary in size from 15 by 18 inches to 22 by 25 inches. There is no official sizing or naming production chart for these glass negatives, only historical record.
A mammoth plate is a photographic plate that is usually 18 x 21 inches, but may vary in size from 15 by 18 inches to 22 by 25 inches. There is no official sizing or naming production chart for these glass negatives, only historical record.
Source: Wikipedia "Mammoth plate" · CC BY-SA 4.0
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