In 1869 he went out with his Camera aloi the line of the newly completed transcontinental ra road, beginning at Promontory, where the lines met, at worked his way southeast to the vicinity of Salt Lal City. He took with him 300 glass plates, cameras, proces ing equipment, and two tents-one for his darkroo and one to sleep in. He covered some 120 miles in thr months. These landscapes so impressed Hayden wh< he saw them that he invited Jackson to join the survi party.
For well over a century San Francisco h been an important transportation and commui cations center. In the early period its contac with the outer world were almost entirely water: by ships engaged in the transpacific tra( by regularly scheduled steamers running to Pa ama and Nicaragua, by others operating aloi the California coast, and still others plying tl waters of the bay and the rivers and sloughs th empty into it.
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.
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