APPENDIX PRELIMINARIES


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APPENDIX PRELIMINARIES
APPENDIX PRELIMINARIESIt is customary to indicate the magnification on a photograph of a microstructure (micrograph), but when the photograph size is changed (such as enlarged), the original magnification must be corrected. A method of avoiding this is to place on the micrograph a bar or marker that has the correct dimension for the magnification of the photograph. Then if the magnification of the photograph is changed, the marker also changes dimensions to maintain the correct dimension at the new magnification.For example, consider a micrograph at 100×. Then a marker 1 cm long would correspond to a dimension of 1/100 = 0.01 cm. It is common to express this in micrometers. Since a micrometer is equal to 10−4 cm, then the 0.01-cm dimension could also be labeled as 100 μm (0.01 × 10,000)…
Citation
Charlie R. Brooks; Ashok Choudhury: Failure Analysis of Engineering Materials. APPENDIX PRELIMINARIES, Chapter (McGraw-Hill Professional, 2002), AccessEngineering Export