Henry Fauld, Scottish physician Japan published in 1880 to identify criminals. 1924 finger print collections of Leavenworth Prison and Bureau of Investigation combined into the records of the FBI largest finger print collection in the world. 3.The topography of this layer determines the shape of the friction ridges 4.sweat and any oil picked up from touching other parts of the body which remain behind on a touched surface leaving the pattern behind of the ridges and known as a latent finger print. Ridge point nearest the two type lines is the delta. The core of the looping lines is the line in the most center point with tightest loop.
All loops have one delta .
Ulnar Loop opens to the ulna bone under the little finger. Radial Loop opens to the radius bone under the thumb. Plain Whorl - if line drawn between the two deltas touches any one of the spiral ridges it is a plain whorl. Central Pocket Loop - if line drawn between the two deltas does not touch a spiral ridge it is a central pocket loop. Double Loop - two loops combined into one print.