Note 159 — Chapter IV

The title-page, according to the custom of the time, gives a somewhat elaborate account of the contents of the volume. It runs as follows:—"The Trissotetras; Or, A most Exquisite Table for Resolving all manner of Triangles, whether plain or sphericall, Rectangular or Obliquangular, with greater facility, then [than] ever hitherto hath been practised: Most necessary for all such as would attaine to the exact knowledge of Fortification, Dyaling, Navigation, Surveying, Architecture, the Art of Shadowing, taking of Heights and Distances, the use of both the Globes, Perspective, the skill of making Maps, the Theory of the Planets, the calculating of their motions, and all other Astronomicall Computations whatsoever. Now lately invented, and perfected, explained, commented on, and, with all possible brevity and perspicuity, in the hiddest and most researched mysteries, from the very first grounds of the Science it selfe, proved, and convincingly demonstrated. By Sir Thomas Urquhart of Cromartie, Knight. Published for the benefit of those that are mathematically affected. London, Printed by James Young. 1645."