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Dear Robles Macias, I don't know where you may find that article but, from your query and knowing your interest, I can infer that you are interested in plotting a grid of a gnomonic projection. Being the Ortographic, Gnomonic and Stereographic projections the only "pure" projective projections of the earth on a plane surface, to draw them is an exercise of Descriptive Geometry. Judging from the date of the article (1962) I do believe that the author is not dealing with a software able to draw automatically the GP but with something very close to the manual methods used from the Renaissance onward. I teach projective geometry at the University and making projective projections of the sphere are among the exercises I give to my students, just to learn and become acquainted with geometrical drawing. If you may have easy access to a professor of Projective Geometry, he/she can explain the construction in one hour lesson. I do fear you need a person and not a book for all the books known to me on projections (and we have a great deal of choices and very good manuals on them, Snyder's ones are among the best) show you only the grid already drawn and explain you the mathematical formulas and the peculiarities of the projections but NO ONE explains the geometric (projective) approach to (construction of) them. I may try to find out some of the drawings of my students, choose the most clear, digitizing it and sent it to you, unless you may spend half a day in Venice (Italy). It would be a pleasure. Ciao. vladimiro Il giorno 26/set/2010, alle ore 22.39, Luis Angel Robles Macias ha scritto: > This is a MapHist list message (when you hit 'reply' you're replying to the > whole list) > o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + o + > > Dear Maphisters, > > I am trying to obtain the following short article published in 1962: > > Title: A method of plotting meridians and parallels on the Gnomonic projection > > Author: R.J. Gregson > > Journal: CARTOGRAPHY > > Volume: 4 > > Issue: 4 > > Pages: 155-156 > > > My university library has requested it, unsuccessfully, to the following > libraries: > > · Australian National University Library > > · Library of Congress > > · British Library > > · Bodleian Library > > > As far as I have been able to gather, this “Cartography” journal was an > Australian publication with ISSN 0069-0805. A few years ago it merged with > “The Australian Surveyor”, giving as a result the "Journal of Spatial > Science", ISSN 1449-8596. > > I would greatly appreciate if somebody could provide some indication > regarding the location or contents of this article. > > > Best regards, > > Luis A. Robles Macías > > _______________________________________________ > MapHist: E-mail discussion group on the history of cartography > hosted by the Faculty of Geosciences, University of Utrecht. > The statements and opinions expressed in this message are those of > the author and do not necessarily reflect those of the University of > Utrecht. The University of Utrecht does not take any responsibility for > the views of the author. > List Information: http://www.maphist.nl > > Maphist mailing list > [email protected] > http://mailman.geo.uu.nl/mailman/listinfo/maphist _______________________________________________ MapHist: E-mail discussion group on the history of cartography hosted by the Faculty of Geosciences, University of Utrecht. The statements and opinions expressed in this message are those of the author and do not necessarily reflect those of the University of Utrecht. The University of Utrecht does not take any responsibility for the views of the author. List Information: http://www.maphist.nl Maphist mailing list [email protected] http://mailman.geo.uu.nl/mailman/listinfo/maphist
