ISSN: 0022-1198
CODEN: JFSCA
Published Online: 1 March 1988
Page Count: 8

Class Defects in Printwheel Typescript
Behrendt, JE
Document analyst, Regional Crime Laboratory, U.S. Postal Inspection Service, TN

(Received 23 May 1987; accepted 16 June 1987)

Abstract

Although the identification of printwheel typescript is predicated on the characteristics of the typing system, most of the identifying defects encountered are normally ascribed to the printwheel. Typescript samples from several new printwheels of different manufacture were examined to ascertain whether class defects are present in printwheel typescript. It was found that several different types of class defects commonly occur in typescript samples of new printwheels. These class defects often appear similar to individual identifying characteristics, when in fact, they are indicative of an entire group of printwheels.

Keywords:
questioned documents, typewriters, printing equipment, printwheels, typewriter identification

Paper ID: JFS11946J
DOI: 10.1520/JFS11946J
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