National Gazette

Inventions and Improvements.

The science of Mechanics, is much in-
debted to the ingenuity of Mr. Robert
Leslie of the city of Philadelphia. The
following is handed to us as a list of a
few of the inventions and improvements
not including those on time-pieces, &c.
which he has made during his residence
here. Their merit will no doubt bring
them soon into general use.

A machine for threshing wheat, on a
new plan.

A horizontal tide-mill, to work with
both tides.

A boat to sail directly against the wind,
or in any other direction.

A horizontal wind-mill, so constructed,
that the wind acts on both sides of the
wheel at the same time.

An improvement on the common
Wheat-Fan, by which it is made to pro-
duce more wind with less labour—

An apparatus for blowing the fire of
any kind of furnace by a stream of water
without a bellows. The power of this
contrivance may be increased to a greater
degree with a given quantity of water,
than the same quantity could produce
if applied to giving motion to a common
bellows.

A machine for measuring a ship’s way.

An improvement on carriage springs.

A standard of invariable length, by
means of a cylindrical rod of iron of such
length as to perform its vibrations in one
second of mean time.

A method of continuing the impres-
sions in dies for coining and other pur-
poses, uniformly the same as long they
may be wanted.

Several useful discoveries in mills &c.