Typewriter Individuality

Type

Concept

First appears

Book 2 · Ch. 4

Books

1

Typewriter Individuality emerges in the Sherlock Holmes canon as a groundbreaking forensic technique that treats the mechanical quirks of Victorian typewriters—unique worn letter patterns, misalignments, and ink distribution—as individual as fingerprints. First introduced in "A Case of Identity," this concept transforms document analysis from mere handwriting comparison to a precise science of mechanical identification. The method proves pivotal in exposing fraud and deception, establishing a new standard for authenticating written evidence in the Holmes universe.