By Barbara Wheeler
Forensic Microscopy: A Laboratory guide will give you the scholar with a realistic evaluate and figuring out of many of the microscopes and microscopic concepts hired in the box of forensic technology. each one laboratory test has been conscientiously designed to hide the diversity of proof disciplines in the forensic technology box with conscientiously set out goals, factors of every subject and worksheets to aid scholars assemble and examine their results.The emphasis is put on the sensible features of the research to counterpoint scholar knowing via palms on adventure. The experiments circulate from uncomplicated via to specialized and feature been built to hide numerous proof disciplines inside forensic technological know-how box. The emphasis is put on recommendations at the moment utilized by hint examiners.This distinct, forensic centred, microscopy laboratory guide offers pursuits for every subject lined with experiments designed to augment what has been learnt besides finish of bankruptcy questions, record specifications and diverse references for additional interpreting. influence proof corresponding to fingerprints, shoe tread styles, software marks and firearms can be analysed utilizing basic stereomicroscopic suggestions. physique fluids drug and hint facts (e.g. paint glass hair fibre) might be lined by means of various microscopes and really good microscopic thoughts.
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Record the magnification. 18. Do you have more ‘depth of field’ at low or high power? 19. Examine a dollar bill under low and high power on the stereomicroscope. Are the fibers intertwined? What color fibers do you see? Draw what you see. PART III: TRACE EVIDENCE UNKNOWN Now use a stereomicroscope to examine an unknown sample and determine the possible contents. 1. Examine the known samples taking note of color, size, shape, texture, and any other characteristics viewed. Use the following worksheet to describe each sample that might be present in the Petri dish.
STEREOMICROSCOPE 9 15. Using the circle templates located in Appendix F, make a drawing of the letter ‘e’ on low and high power. Determine the magnification each time and record the total magnification. Try to fill the field of view. 16. Now, move the sample to the right, towards you, and away from you. Note the direction in which the ‘e’ appears to move in respect to the original placement. 17. Next, examine samples of tea, cigarette tobacco, and cigarette ash under both low and high power. Draw what you see.
What did you observe? What are your conclusions? 5. Choose two of the unknown glasses. Write down their numbers. 6. ’ Remember that the Becke Line moves to the medium with the higher refractive index. Note that even though there are 15 different immersion liquids, only 4 of them need be used. Follow the diagram in Figure 2D-3. n glass < n liquid n glass > n liquid 8 12 4 2 1 6 3 5 10 7 9 14 11 13 15 Figure 2D-3 Refractive index flow chart. Start with solution #8. If the index of refraction of the glass is greater than the liquid’s, move on to solution #12.