A Treatise Of GnomonicksOzanam was a mathematician famous for his popular math texts. These included a math dictionary, a course of mathematics, and a text on mathematical and physical recreations. The last of these went through at least 18 editions over 2 centuries. Ozanam's dialing was instructive and entertaining it includes innovative ideas such as a geographic sundial showing the time anywhere in the world, various universal horizontal dials, and the first suggestion