To the Honorable, Respected, and Wise Gentleman,

Thomas Lebzelder, Electorate of Saxony Factor, Councilor,

and Church Elder at St. Thomas in Leipzig, my especially favorable brother-in-law.

Honorable, Respected, and Wise, especially favorable brother-in-law, since I published last year the fifth part of the Theatrum Machinarum, which treats of graceful fountains, jet-d’eaus and draw-wells, and the like, and since now, from various places and persons, it has been suggested to me that I also edit the sixth and last part so that the work might be fully completed, I have not wished or been able to refuse this any longer. For in this last part, no less than in the others preceding it, beautiful and useful machinæ are presented, which one may utilize in hydraulic structures, pile-driving, draining moats, building bridges, and many other artistic works besides. Also, there are to be found herein some inventiones of rare reading desks, roasting jacks, and, finally, as a conclusion, the whole foundation and proportion of musical instruments, otherwise called Monochordum. As my intention in the preceding parts has been solely and exclusively directed toward bringing to light such hitherto in the German language little