Fingerprinting Arches FSC 340
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This 3 page Class Notes was uploaded by Chelsey Smith on Thursday October 13, 2016. The Class Notes belongs to FSC 340 at University of Southern Mississippi taught by Dr. Dean Bertram in Fall 2016. Since its upload, it has received 14 views. For similar materials see Fingerprinting in Forensic Science at University of Southern Mississippi.
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Date Created: 10/13/16
FSC 340 Fingerprinting October 11, 2016 Arches There are 2 types of fingerprint arches: Plain and Tented arches Plain arches have an even ridge flow from one side to the other of the pattern, with no significant up thrusts 3 Tented Arch Types o Angular o Upthrusting o Looping Type Angular Tented Arches o Formed by 2 ridges meeting at an angle o The angle must be 90° or less o Base ridge is directly below the ridge in question o Angular arches do not end in space o If it connects to the top ridge the angle must be 90° Upthrusting Tented Arches o Cannot be a dot o Must be a ridge that ends in space can’t touch the top ridge o It must angle 45° or more from the base ridge to change directions o A= plain arch in positions 2,7; a= plain arch o T= tented arch in positions 2,7; t= tented arch Loop Type Tented Arch o Must have 2 of the 3 requirements of a loop o Delta o Sufficient Recurve o Ridge Count
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