The American annual of photography . he dimensions of a map tobe covered by a given size plate, the approximate distance fromlens to drawing and the draw of the camera. Of course theuse of a dififerent focus and plate will necessitate the re-calculation of this table, which can readily be done by usingthe formulae as given. When a map was too large to be covered by one plate themap was marked with a line top and bottom so as to act ascutting lines for the proper joining together of the two pieces,these lines appearing on both plates. As to development of the plates and paper used theformulae o
The American annual of photography . he dimensions of a map tobe covered by a given size plate, the approximate distance fromlens to drawing and the draw of the camera. Of course theuse of a dififerent focus and plate will necessitate the re-calculation of this table, which can readily be done by usingthe formulae as given. When a map was too large to be covered by one plate themap was marked with a line top and bottom so as to act ascutting lines for the proper joining together of the two pieces,these lines appearing on both plates. As to development of the plates and paper used theformulae of the maker was used as to developer, and as thereproductions were to be used for calculations a glossy paperwas used of high contrast. The above illustrates very clearly the use of the apparatusyou may have at hand to photograph to a given scale shouldanyone be called upon to do this branch of work. Of course,where the necessary apparatus is fixed in a special room, wherea specialty is made of this branch of the art, the work is 34. wo Q < pqQ W CO 35 greatly simplified, but not having the proper facilities theforegoing is of value to the amateur. The accuracy of the reproductions of these maps were sothat the necessary calculations were made from them insteadof from the bulky lOO feet to the inch blue prints furnishedfor calculation purpose. As the mine workings in the beds did not extend over theentire property, only being shown where worked, it wasnecessary to make an outline property map showing all pantograph reduction was made for check purposes, andwhen the photographic prints were laid on this outline thecorners were found to coincide very accurately. Another interesting piece of work was suddenly thrust uponme when I was called upon to enlarge a section of one ofthe United States Topographical maps, the enlargement to times greater than the original to fit a certain scalemap. In this I was handicapped by not having a largeenough enlarging lante
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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
