DECLARATION.

PROP. XXXVI.

A new method for a machine, by which boats having arrived at the port, filled and laden with water or any other thing whatsoever, may be unloaded with little effort.

In the east is a boat which is to be unloaded, for example, full of water; so that this may be done easily, the mechanism is constituted as we see depicted here, the parts of which, when declared, will be able to assist. The entire frame rests upon a pivot like a windmill, so that it can be moved by a beam which verges toward the west, distant 21 palm-widths from the meridian line. In the middle of this is the inner part of a screw, around which the outer part moves freely, in which there are two wooden arches which adhere to two arms, so that those things which raise and depress the aforesaid arches may be moved freely; from these arms, however, pipes hang on both sides, which are constrained by the columns of the frame. The rest is obvious.

PROP. XXXVII.

A new composition of an instrument for unloading larger ships laden with weights and masses of any vast size whatsoever, with a wonderful economy, by the ministry of a screw and a balance.

These things are clear to those who can judge such matters from the picture, and who have seen machines suited to the same; for the entire power of the machine is in the screw. Its frame, however, rests upon a pivot like the previous one. But let us state everything specifically.
The part which verges toward the north with a cylinder is fixed and firm on the ground due to the gravity of the weight; the rest of the frame of the beams, which is around the cylinder, is rotatable and carries the balance hanging from east to west, 3 measures and 11 palm-widths long, in the eastern part of which are chains by which the burden is seized. In the other is the outer part of the screw, which, suspended by pivots, moves circularly so that it may freely receive the inner screw, which is fixed to the drum moving itself freely between those two timbers which are distant from the meridian line 2 measures and 6 palm-widths, and which are parallel to it. Now, if the work is not strong enough to move it, one can use the prepared weights, which are hung from the balance, as the proposition desires.

PROP. XXXVIII.

The form of a new machine for unloading any ships whatsoever that have arrived at the port, hindered by the weights of columns or other things of this kind.

This machine, like the preceding ones, rests upon a pivot and is turned by this staff, which verges from the middle of its base toward the angle of the west and the north. It is constructed like a crane. The "Crus" (leg) is an instrument which architects use for elevating the largest stones, but in the middle it has an inner screw around which an outer one is rolled, which is distant 3 measures from the meridian line. This is compelled by slots existing in the lateral timbers, and from it a rope or chain is produced to the western pulley of the jib; then, it is stretched to the burden, which is lifted by the hand of two men who work the screw.

PROP. XXXIX.

A new machine for removing earth from a trench with little expense and number of workers, and for leading the earth to a rampart within suitable walls.

Words cannot sufficiently explain how useful this machine is, since by its benefit six men can do as much as thirty. It is structured thus: from south to north are extended two very large timbers, whose length is 3 measures and 3 palm-widths, and at whose northern end is a triple-pulley, the figure of which is in the void verging toward the west with a drum, the form of which is painted toward the east; similar to this drum is another toward the south, so that with one pulling upward and the other downward, greater force and speed are achieved by the instrument. The chain, however, with the staves, just as it is painted, goes around the frame of the two aforementioned timbers with the drum, and a basket is tied to each stave, indeed fastened so that it cannot be inverted. This was what needed to be said.

PROP. XL.

An artifice invented by the author for moving a column or obelisk, even if huge, from its upright position, transporting it thence anywhere both most safely and at the minimum expense, and again erecting it in a firm place.