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Alphonse Bertillon

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Alphonse Bertillon was a French police officer and a biometrics researcher.

Bertillon, Alphonse, fiche anthropométrique recto-verso
Bertillon, Alphonse, fiche anthropométrique recto-verso

He is best known for creating the first scientific system for identifying criminals. This system was called anthropometry. It used physical measurements to create unique records for individuals. Before his work, police relied mostly on names or simple photographs. These methods were often unreliable because people could easily use false identities. Bertillon's invention changed how law enforcement approached criminal identification.

His method, known as the Bertillon system, relied on specific body measurements.

Bertillon - Signalement Anthropometrique
Bertillon - Signalement Anthropometrique

The process involved taking five primary measurements of the human body. These included the length of the head and the breadth of the head. He also measured the length of the middle finger. Additionally, he recorded the length of the left foot and the length of the cubit. These measurements were combined with a standardized photograph. This type of photograph is what we now call a mug shot.

Parle class 2162889173 72eaace2e1 o
Parle class 2162889173 72eaace2e1 o

By combining data and images, police could access criminal records quickly.

Bertillon's career began in Paris on March 15, 1879. He started working as a department copyist at the Prefecture of Police. He was a very orderly man who noticed a growing problem. The rate of recidivism, or repeat offending, had been rising in France since 1870. Many criminals were being arrested multiple times under different names. Bertillon decided to develop a solution in his spare time. He conducted his research at the La Santé Prison in Paris. During this time, he faced jeers from both prisoners and other police officers.

While anthropometry was a major achievement, the system had several flaws. It was primarily designed for adult men with short hair. Because of this, it was not very accurate for children or women. The system was also used in ways that were not always fair. In Minneapolis, Minnesota, the police used the system to categorize Black women. These women often used aliases, such as the name "Mamie," to avoid being identified. This shows how identification systems can be used as tools for policing specific groups.

Bertillon also contributed to the field of forensic science in other ways. He developed techniques for studying ballistics, which involves the science of projectiles. He also used galvanoplastic compounds to help preserve footprints. Furthermore, he invented the dynamometer. This tool was used to measure the amount of force used during a break-in. He also published work regarding fingerprinting. In a 1912 paper, he discussed comparing sixteen ridge characteristics to identify latent prints. Eventually, fingerprinting became more common and replaced his measurement system.

One of the most serious moments in Bertillon's career involved the Dreyfus affair. In 1894 and 1899, Bertillon served as a witness for the prosecution. He testified that Alfred Dreyfus had written a specific document called a bordereau. Bertillon claimed his handwriting analysis was based on mathematical probability calculus. However, he was not actually a handwriting expert. His evidence was flawed and helped lead to the wrongful conviction of Dreyfus.

The speaking portrait
The speaking portrait

In 1904, three mathematicians analyzed his methods. They concluded his system had no scientific value. Dreyfus was finally acquitted in 1906 after his innocence was proven.

Alphonse Bertillon's legacy lives on in both science and popular culture. His ideas helped establish the foundation for modern forensic science. Even though his specific measurements are no longer used, the concept of biometric identification remains vital. His name and his work appear frequently in detective fiction. The character Sherlock Holmes is linked to his expertise in several stories. Many modern mystery novels and television shows still reference the Bertillon system. He remains a central figure in the history of how we use science to understand identity.

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File:Bertillon - Signalement Anthropometrique.png
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Bertillon, Alphonse, fiche...
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