Excerpt from The Field Practice of Laying Out Circular Curves for Railroads
Their reply was that the continued demand for my book proved that some persons preferred to have the subject of curves in a portable form, by itself. Therefore, partly on that ground, and partly from a wish to show how some of the more useful problems may be applied to curves exceeding I assented to a new edition, and, rather hastily, prepared this.
The extension beyond 1800 has not, I believe, been hitherto attempted, although its utility has of late years been made evident in the tortuous canyons of our Western States and of Mexico.
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