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Sufficient Camera Know-how: Containing the New Optical Laws of the Camera Obscura or Daguerreotype, demonstrated that converging perpendiculars of the Camera image were indeed mathematically correct and concluded: "Art has always represented objects geometrically, or as they cannot be seen in the perpendicular and visually, or as they can be seen in the horizontal direction."3 But his findings were ignored. Indeed, amateurs were warned in manuals and instruction books never to tip the camera. Many hand cameras were even equipped with levels to assure the viewer that he was holding the Camera horizontally.
This book is concerned only incidentally with matters of pure photographic technique. The author suspects that most of the readers of this volume will be persons who already have sufficient Camera know-how to produce pictures with commercial value if their knowledge is properly exercised. Technical advice regarding equipment for each job will be given in this book, and certain methods of approaching certain professional problems will be suggested briefly.
Train Frequency and Timing. Operating consider-ions, then, may dictate that a train will be dis-tched whenever there are sufficient cars to 3et the limits of available motive power or of e sidings and trackage over which it is to oper-;. This might mean, for instance, that cars are 'iving at Chicago in sufficient numbers that .ilroad X can dispatch four maximum-length .ins to Omaha daily, while it receives enough rs for only two such trains to St. Louis. On ; other hand, it is conceivable that during a y the railroad will not receive sufficient cars even one such train. At this point other con-erations enter the operating picture. |
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