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- Title
THE ROLE OF THE PETROGRAPHIC MICROSCOPE IN CRIMINAL INVESTIGATIONS.
- Authors
Faust, George T.
- Abstract
This article examines the role of the petrographic microscope in criminal investigations. There are many instances when it is not possible to completely solve problems involving the analysis of substances by either chemical or spectrographic means. In such cases the determination of the index of refraction and other optical properties by means of the petrographic microscope may prove of value. Research, especially with various types of glass, indicates the danger of forming too hasty a decision based solely upon the index of refraction. There are times when it will yield a definite answer, as where there is a difference in refractive index, but in other instances it is advisable to make other examinations as well. Another interesting case in which the petrographic microscope offered a distinct solution involved a broken grinding wheel. An injured workman alleged that the emery wheel, which broke and struck him was of a certain manufacturer's product. The wheel was submitted for petrographic study, together with samples of Turkish and Grecian emery ores. A sample of the unknown wheel was treated with a 0.5% sodium hydroxide solution to remove the bond.
- Subjects
PETROGRAPHIC microscope; OPTICAL instruments; REFRACTIVE index; REFRACTION (Optics); SODIUM hydroxide; LAW enforcement; CRIMINAL investigation
- Publication
Journal of Criminal Law & Criminology (08852731), 1940, Vol 31, p246
- ISSN
0885-2731
- Publication type
Article
- DOI
10.2307/1136375