Human hair seen through a microscope, 1931
Healthy hair bulb, 1931
Transverse hair sections, 1931
Red hair, 1931
Hair in old age, 1931
Guinea pig blood crystals, 1871
Baboon blood crystals, 1871
Dr. J. J. Woodward's Microscope,
Light Grand American Microscope, Philadelphia; Manufacturer: Joseph Zentmayer, 1864
Woodward's photomicrography apparatus, Washington, D.C., about 1876
Woodward's photomicrography apparatus, Drawing, 1867
Red hair, 1931
Red hair, 1931
John Glaister Jr., M.D., A study of hairs and wools belonging to the mammalian group of animals, including a special study of human hair, considered from the medico-legal aspects, Cairo, Egypt
National Library of Medicine
Image 4 of 10

The invention of photomicrography

In the 1870s, U.S. Army surgeon Joseph Janvier Woodward invented a technique of photographing objects seen under a microscope. Woodward's photomicrographs—made with a room-sized apparatus that used direct sunlight as the light source—caused a sensation when exhibited at the 1876 Centennial Exposition in Philadelphia. After further development, photomicrography enabled forensic investigators to make visual records of what they saw. The photographs served as an aid to analysis and could be presented as evidence in the courtroom.


Photomicrograph: A photograph of a microscopic view; a photograph of what one might see looking through a microscope. In contrast, a microphotograph is a very small photograph that can only be seen with the aid of a microscope.