Loechel, William E.

Henry Ford Health System Scholarly Commons

Henry Ford Hospital Medical JournalVolume 9 | Number 3 Article 119-1961A Method Of Orthographic Projection ForDelineating And Measuring Gross SpecimensWilliam E. LoechelFollow this and additional works at: https://scholarlycommons.henryford.com/hfhmedjournalPart of the Life Sciences Commons, Medical Specialties Commons, and the Public HealthCommonsThis Article is brought to you for free and open access by Henry Ford Health System Scholarly Commons. It has been accepted for inclusion in HenryFord Hospital Medical Journal by an authorized editor of Henry Ford Health System Scholarly Commons. For more information, please contactacabrer4@hfhs.org.Recommended CitationLoechel, William E. (1961) "A Method Of Orthographic Projection For Delineating And Measuring Gross Specimens," Henry FordHospital Medical Bulletin : Vol. 9 : No. 3 , 422-423.Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol9/iss3/11A METHOD OF ORTHOGRAPHIC PROJECTION FOR DELINEATING AND MEASURING GROSS SPECIMENS W M . E . LOECHEL* There are frequent occasions when a gross specimen or a series of specimens present extremely valuable details which are easily appreciated when the object can be handled and examined but which seem to defy concise representation when drawn in two dimensions for publication. To sketch such subjects is time consuming and is not accurate to the degree that one might wish. In addition, one's final product is a three dimensional appearing subject, complete with perspective which is definitely not wanted in these instances. The same is true of the photographic effort, especially if the surface is large and receding or if there are several areas in the depth of the single subject that should receive attention. The author first met with this problem while attempting to produce brain maps and topographical studies of the Sylvian fissure. A relatively simple solution was found which would allow any point (or area) to be delineated as a direct projection upon a common flat surface. The accompanying sketches shew the method of delineation. One has simply to position the subject as he wishes and support a piece of thin picture glass above it, as close to the surface of the specimen as possible, being earelul to see that the glass is in a plane parallel to the one upon which the specimen rests. Alter sighting through (or lining up) the two etched points, a tine pen is used to make a small dot cn the glass. By continuing to sight and mark, the entire course cr contour of the subject will be plotted. If all is correctly ahgned, the end result will be a ful l scale projection of the subject. Artistic talent is not a requisite; one has only to fix the axes and planes of his specimen and glass and the delineation becomes automatic. The mark made by the pen should not be visible until the "sight" is moved to the next step along the line. Results are often surprising: this type of delineation is the mechanism for removing the natural tendency to see perspective. The completed drawing on the glass plate can be traced on suitable paper lor publication. "Director, Medical Illustration Department 422 Orthographic Projection Plas t ic 'siohi' o C a m e r a o r eye Apparatus for orthographic projechon 423 

A Method Of Orthographic Projection For Delineating And Measuring Gross Specimens

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