Identification of Typewriter Ribbons
Charlotte L. Brown, Paul L. Kirk · The Journal of Criminal Law Criminology and Police Science · 1956
a member of the staff of the School of Criminology, Univer-sity of California, has collaborated with Dr. Kirk in the research and presentation of several articles that have appeared in this Journal during the last few years. Two of these, which appeared in volume 45, dealt with methods of identifying various types of writing inks. Paul L. Kirk is Professor of Criminology at the University of California and has con-tributed periodically to this Journal during the last fifteen years. He is the author of "Crime Investigation " and numerous articles on various laboratory techniques in several branches of criminalistics.-EDITOR. In the examination of typewritten documents it is frequently desirable to determine that a particular ribbon was used, that two or more documents were prepared with the same ribbon, or that more than one ribbon was used in preparing a single docu-ment. It is sometimes possible to identify an individual ribbon by thread count with magnification of the typed material. This procedure is often not possible, and at its best will not aid in the determination of the brand of manufacture of an unknown