PLAIN ARCHPLAIN ARCH

Definition: A PLAIN ARCH is that type of pattern in which ridges enter upon one side, make a rise or a wave in the

center and flow or tend to flow out upon the opposite side.

Definition: A PLAIN ARCH is that type of pattern in which ridges enter upon one side, make a rise or a wave in the

center and flow or tend to flow out upon the opposite side.

Classified as “AA”Classified as “AA”PLAIN ARCHPLAIN ARCH

ARCHESARCHES

1 2 3 4

5 6 7 8

9 10 11 12

AAAA

PLAIN ARCHPLAIN ARCH

AAAA

PLAIN ARCHPLAIN ARCH

AAAA

PLAIN ARCHPLAIN ARCH

TENTED ARCHTENTED ARCH

A TENTED ARCH is that type of pattern which possesses either an angle, an upthrust or two of the three basic

characteristics of the loop.

A TENTED ARCH is that type of pattern which possesses either an angle, an upthrust or two of the three basic

characteristics of the loop.

Classified as “TT”Classified as “TT”

TENTED ARCHTENTED ARCH

TENTED ARCHES TENTED ARCHES ANGLE TYPEANGLE TYPE

TTTT

TENTED ARCHTENTED ARCH

UPTHRUST TYPEUPTHRUST TYPE

TENTED ARCHES TENTED ARCHES

TTTT

TENTED ARCHTENTED ARCH

TTTT

TENTED ARCHTENTED ARCH

TENTED ARCHES TENTED ARCHES LOOPING TYPELOOPING TYPE

A “looping type” tented arch possesses 2 of the 3 characteristics of a loop pattern (core, delta, count across a

looping ridge).

A “looping type” tented arch possesses 2 of the 3 characteristics of a loop pattern (core, delta, count across a

looping ridge).

D

C

TT

01

TT

01

TENTED ARCHTENTED ARCH

TTTT

TENTED ARCHTENTED ARCH

TTTT

TENTED ARCHTENTED ARCH

TTTT

TENTED ARCHTENTED ARCH

TENTED ARCHTENTED ARCH

TTTT

ARCH FREQUENCYARCH FREQUENCY

TENTED40%

PLAIN60%

TENTED40%

PLAIN60%

Questions?Questions?