# Macrograph

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{{Short description|Low magnification image}}
{{Hatnote|Compare [macro photography](/source/macro_photography).}}
A '''macrograph''' or '''photomacrograph''' is an image taken at a scale that is visible to the [naked eye](/source/naked_eye), as opposed to a [micrograph](/source/micrograph)ic image, taken with a [microscope](/source/microscope). It is sometimes defined more precisely as an image at a scale of less than ten times [magnification](/source/magnification).<ref>[http://www.engnetglobal.com/tips/glossary.aspx?word=Macrograph Macrograph] EngNet Engineering Dictionary</ref>

==Materials science==
This term is often applied to a three-dimensional image taken of a material using a low-power [stereomicroscope](/source/stereomicroscope). These images are used in [materials science](/source/materials_science), particularly in the study of [stress fracture](/source/stress_fracture)s in metals.<ref>[http://www.tec-eurolab.com/eng/metallographic-examinations.asp Metallographic examinations] {{webarchive|url=https://web.archive.org/web/20081011105131/http://www.tec-eurolab.com/eng/metallographic-examinations.asp |date=2008-10-11 }} TEC Eurolab, Accessed 12 May 2008</ref><ref name=Milan2004>{{cite journal | author = Milan, M.T. |author2=Spinelli, D. |author3=Bose Filho, W.W. |author4=Montezuma, M.F.V. |author5=Tita, V. | year = 2004 | title = Failure analysis of a SAE 4340 steel locking bolt | journal = Engineering Failure Analysis | volume = 11 | issue = 6 | pages = 915–924  | doi = 10.1016/j.engfailanal.2003.12.003}}</ref> This method can also be used to assay the fine structure of steel, in a standardized test called the Baumann method that creates a [sulfur print](/source/sulfur_print) showing the amount and distribution of sulfur inclusions through the metal structure.<ref>Arthur J. McEvily (2001) [https://books.google.com/books?id=qoEq8ZLhPJkC&q=macrographic&pg=PA90 Metal Failures: Mechanisms, Analysis, Prevention] Wiley-IEEE p 90 {{ISBN|0-471-41436-0}}</ref>

==References==
{{reflist|2}}

Category:Laboratory techniques
Category:Materials science

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