The American annual of photography . about lenses, having cleaned his own twice. Thenhe showed me an article by Mr. Fusticus on how to use arising and falling front on a kodak. Mr. Fusticus is going towrite us another article some day on how to use a sliding fronton a kodak, as well as a swing back, with an appendix tellinghow to make 24-karat gold from bituminous coal. There werearticles on lenses by the mile—pitiful re-hashes of elementaryprinciples that have been told in every annual, British andA^merican, for so many years that why waste space. Now the conclusion reached:—In my opinion all
The American annual of photography . about lenses, having cleaned his own twice. Thenhe showed me an article by Mr. Fusticus on how to use arising and falling front on a kodak. Mr. Fusticus is going towrite us another article some day on how to use a sliding fronton a kodak, as well as a swing back, with an appendix tellinghow to make 24-karat gold from bituminous coal. There werearticles on lenses by the mile—pitiful re-hashes of elementaryprinciples that have been told in every annual, British andA^merican, for so many years that why waste space. Now the conclusion reached:—In my opinion all this fogabout optics, and chemistry, that produces the articles by Pol-doody, Fusticus & Co. in our literature can be easily cleared , my dear brothers, these chaps do not know any-thing about these subjects or they would not write these arti-cles. Take one of them to any teacher of physics, or to anyman who can write Bachelor of Science after his name andask him, and youll get a surprise. Youll be told that the. THE SUNBEAM. ALFRED B. CASE. 147 ?-o author did not know what he was talking about, when he tellsof giving a practical test to a lens, to determine its perform-ance. I have more apparatus for this purpose than the averageamateur (or professional) ever saw, and have been trained inthis work, and I can assure any of my readers that there isonly one kind of a test for a lens—that is one made withproper instruments by a skilled operator of experience—anyother test is not worth making for it tells you nothing. I seelovely little diagrams of shutter testers in the magazines everylittle while—the errors of such machines will probably not bemore than ioo%—in fact after trying one, you will be nearlyas well off as if you had shaken dice about it. The layman does not realize the difficulties that obtrudethemselves in a matter which seems as simple as this. In thefirst place any of the methods of shutter testing in current use,such as the Wynne Tester, th
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