Typewriter Individuality

In the Sherlock Holmes series, the concept of 'Typewriter Individuality' emerges as a pioneering forensic technique in the Victorian era, where each machine's worn letter patterns serve as a unique identifier akin to a human fingerprint. Introduced in 'The Adventures of Sherlock Holmes,' this method allows Holmes to trace anonymous documents to their precise mechanical origins, showcasing his innovative application of scientific scrutiny to criminal investigation. Though appearing in only one collection, it exemplifies the series' evolution toward integrating emerging technologies into deductive reasoning, influencing Holmes' methodology across subsequent tales.