Excerpt from Impressions of America

To return to the illustrations in this book. The left-hand picture of every pair represents the particular view as seen by the left eye, and the other, the same View as seen by the right eye at the same time and we have only to devise some means of seeing each View with the proper eye, and that eye only, to cause the observer to see the photographic representation of the View in all the original's relief. It will no longer look ¿at, but the different distances of objects stretch ing away, one after another, into the distance, will be as clearly visible as they were to the author when he was taking the photograph. The result is that the picture becomes so much more real and intelligible, that the writer thinks it worth a considerable amount of trouble to acquire the power of seeing the views stereo scopically either by means of a stereoscope, such as is supplied with this book, or, - though in most cases it demands some little perseverance, - by the method to be presently described which needs no instrument, and which, when once learnt, cannot be forgotten and is perfectly easy.

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