CHY 183 Lecture Notes - Lecture 4: Cyanoacrylate, Reagent, Black Carbon

• School: Ryerson University
• Department: Chemistry
• Course: CHY 183
• Professor: Monica Sauer

Document Summary

History of (cid:862)west brothers(cid:863) identification: similar bertillion classification causes problems b/c pictures/measurements maybe similar. In 1903, when bertillion system could not distinguish b/w 2 men (william west + will. Fingerprint principles: fingerprints are reproduction of friction skin ridges found on palm side of fingers + thumbs. Principle one: mathematically, probability for existence of 2 identical fingerprint patterns in (cid:449)orld"s population is extremely small. Galton calculated existence of 64 billion different fingerprints: besides theoretical calculations, of the millions upon millions of individuals who have had their prints classified, no 2 fingerprints have been found to be identical. I(cid:374)di(cid:448)idualit(cid:455) of fi(cid:374)gerpri(cid:374)t is(cid:374)"t deter(cid:373)i(cid:374)ed (cid:271)(cid:455) it"s ge(cid:374)eral shape/patter(cid:374), (cid:271)ut (cid:271)(cid:455) (cid:272)areful stud(cid:455) of it"s ridge (cid:272)hara(cid:272)teristi(cid:272)s k(cid:374)o(cid:449)(cid:374) as minutiae. It"s identity, number + relative location of these minutiae that imparts individuality to fingerprint: some common fingerprints ridge characteristics are bifurcations, ridge endings, ridge dots + enclosures.