De Beghinselen Der Weeghconst

"The Principles of the Art of Weighing") is a book about statics written by the Flemish physicist Simon Stevin in Dutch.

"The Act of Weighing"), De Beghinselen des Waterwichts ("The Principles of Hydrostatics") and an Anhang (an appendix).

The importance of the book was summarized by the Encyclopædia Britannica:[2] In De Beghinselen der Weeghconst (1586; “Statics and Hydrostatics”) Stevin published the theorem of the triangle of forces.

He also discovered that the downward pressure of a liquid is independent of the shape of its vessel and depends only on its height and base.The first part consists of two books, together account for 95 pages, here divided into 10 pieces.

Start: panegyrics, Mission to Rudolf II, Uytspraeck Vande Weerdicheyt of Duytsche Tael, Cortbegryp Bepalinghen and Begheerten (definitions and assumptions)