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Doc. 46.] SWEDENBORG TO ERICUS BENZELIUS. 231
4. For constructing sluices in places where there is no
fall of water, by means of which entire ships with their cargoes
may be raised to any height required within an hour or two.
5. A machine driven by fire, for throwing out water, and
a method of constructing it near forges, where the water
has no fall, but is tranquil. The fire and chimney would
supply a sufficient quantity of water for the wheels.
6. A draw-bridge which may be closed and opened within
the gates and the walls.
7. New machines for condensing and exhausting air by
means of water. Also a new pump acting by water and mercury,
without any syphon, which presents more advantages, and works
more easily, than the common pumps. I have also, besides
these, other new plans for pumps.
8. A new construction of air-guns, thousands of which
may be discharged in a moment by means of one syphon.
9. A universal musical instrument, by means of which
one who is quite unacquainted with music may execute all
kinds of airs, that are marked on paper by notes.
10. Sciagraphia universalis. The universal art of delineating
shades, or a mechanical method of delineating engravings of any
kind upon any surface by means of fire.
11. A water-clock, in which water serves the purpose of an
index, and in which, by the flow of the water, all the movable
bodies in the heavens are demonstrated, with other curious
effects.
12. A mechanical carriage containing all sorts of works,
which are set in motion by the movement of the horses.
Also, a flying carriage, or the possibility of remaining
suspended in the air, and of being conveyed through it.
13. A method of ascertaining the desires and affections
of the minds of men by analysis.
14. New methods of constructing cords and springs, with
their properties.
These are my mechanical inventions which were hereto
fore lying scattered on pieces of paper, but nearly all of
which are now brought into order, so that when opportunity
offers, they may be published. To all these there is added
an algebraic and a numerical calculation, from which the
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