Johnston, Philip Devereux, 1855- · New York, D. Williams Company · leaf 61
FiG. 10. … duced. R R (Fig. 11) are the foci of the two curves,and B, midway between I and J, is called the centre ofthe curve. The nature of the hyperbola is such that thedifference of the distances of any point in the curve,from the foci, is always the same, and is equal to thetransverse axis I J. Thus, if…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from A Dictionary of science, literature, and art [electronic resource]: comprising the history, description, and scientific principles of every branch of human knowledge; with the derivation and definition of all the terms in general use (1844)](https://img.insideoutlibrary.com/img/200/ia-62523189.5956.emory.edu-593-170.webp)
