All of the items in the following list of illustrations (with the exception of the first and the last) have been drawn by the author following the figures in the original manuscripts using the Adobe Illustrator graphics design and drawing program. All these drawings have previously been published in the volumes of the Leibniz Academy Edition. The first and last items are facsimile copies taken from the Oeuvres Complètes de Christiaan Huygens and the Leibniz Academy Edition, respectively.
1 Papinâs submersible vessel (1691) 492
2 Papinâs mechanical thought experiment 529
3 Leibnizâs engineering thought experiment 531
4 Leibnizâs sketch of a damaged rod-engine transmission line 568
5 Leibnizâs drawing illustrating Johannes Teylerâs method of calculating the quantity of fire power in a fortification array 575
6 Sketch of Papinâs thought experiment regarding the substitution or replacement of a body by a surrogate body during a two-body collision 652
7 Another sketch of Papinâs thought experiment regarding the substitution or replacement of a body by a surrogate body during a two-body collision 654
8 Yet another sketch of Papinâs thought experiment regarding the substitution or replacement of a body by a surrogate body during a two-body collision 655
9 Sketch of Papinâs thought experiment to demonstrate the equivalence of separate collisions of a body with two other bodies 657
10 Sketch of Leibnizâs thought experiment regarding the collision of a body moving along the diameter of a square with two other bodies resting at a corner 665
11 Sketch of Leibnizâs design for sealing, or making airtight, the contact between a piston and a pump cylinder 691
12 Papinâs drawing of his new blast furnace 706
13 Sketch of Leibnizâs thought experiment regarding the collision of a body moving along the diameter of a square with two other bodies resting at a corner 759
14 Papinâs sketch of the thought experiment regarding the collision of three spheres at a corner of a square 760
15 Sketch of Leibnizâs physical thought experiment regarding the operating principle of the barometer 777
16 Drawing of Francesco Maria Levantoâs reverberation furnace 805
17 Drawing of Jobst Heinrich Voigtâs threshing-machine 810