The First Book of Mechanical Mathematical Instruments

26     Another similar method for spinning wool more easily.
27     A mechanism with a certain wheel, in the revolution of which and within a certain time, a weight approaches its center, and at another time, it retreats toward the circumference, so that one can then easily use it to lift some large forge hammers to strike the anvils.

I have put this invention forward, not so much to serve where it is accommodated, but to show the error of those who think that by such counterweights they have found or will find perpetual motion original: "mouuement continuel". For through this, one can see that two weights in one and the same wheel, made in this manner, will eventually come to an equal distance from its center, whether one is above and the other below, and thus they will be of equal weight, according to the theorems of Archimedes in his book On Equilibrium original: "æque ponderantibus".

28     A new type of press, more concise and easier than common ones, both for printing books and for stamping all figures carved on brass original: "leton" or copper original: "cuyure".
29     A new fabrication for easily splitting iron, which until now has not been practiced.

This invention also comes from the aforementioned Desrué, who first provided the demonstration and the experiment for it.

30     A new machine by which, and by the force of the wind, one can easily saw wood where one would lack water or laborers to do so.
31     A device by which, and by the blowing of boiling water, blacksmiths can have a continuous wind in their forge in place of bellows.
32     A new way of building, in which the stones are so interlocked and chained one to the other that one could easily construct very large vaults, which are nevertheless smaller than a semicircle, that will not push the walls to one side or the other.
33     Another form of interlocking and chaining stones together, by which one could easily build large vaults that, on the inside of the building, will be flat and rectilinear.
34     Another principle, drawn from the preceding one, by which the same vaults will seem to be suspended in the air.
35     A new invention of an horologeographic time-measuring/dial-making instrument, by which one could easily draw all kinds of clocks on any surface whatsoever.
36     Another new and recent geometric instrument, by which all