A micrograph or photomicrograph is a photograph or similar image taken through a microscope or similar device to show a magnified image of an item. Canadian inventor Reginald Aubrey Fessenden is credited with inventing photomicrography. A microphotograph is a very small picture.
from Popular Mechanic
Snowflake Photomicrographs c 1922
Wilson Bentley 1866 – 1931
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