regulating principle as to keep up a supply
of water within the boiler, without any attention from the engineer;
and in case that the apparatus itself should become impaired or cease
to operate regular, the engineer becomes instantly notified thereof.

EXPLANATION.--It is inexpedient for us to give a full and minute
description of the several points and peculiarities of the mechanism
of this apparatus; but we may so far explain as to say that a
horizontal lever inside of the boiler, being mounted on a pivot near
its centre, and connected to a buoy or float at one end, as
represented in the engraving, (a part of the surface of the boiler
being omitted for that purpose, and not, as some might infer, to
represent the apparatus attached to a boiler already burst by an
explosion.) One of these floats is placed within a small enclosed box
within the boiler, that it may be secure from the effect of foam which
sometimes pervades the surface of the water in a steam boiler.--This
lever, near its bearing, is connected to a short valve-rod, which
governs the valves in a small valve-chamber, whereby the steam is
occasionally admitted to operate a small steam engine, placed directly
over the boiler; and this engine puts in motion a pump, by which the
water in the boiler is replenished. This engine, it will be
understood, is never put in operation except when the water in the
boiler becomes too low: and when the water rises, the elevation of the
encased float closes the valve and stops the engine. The ball on the
end of the lever acts as a counterpoise to the float, (which is of
stone) that it may be freely influenced by the rising or falling of
the surface of the water.

The small engine constructed by Mr. Barnum for this purpose, is well
adapted to its place, and has several peculiarities whereby the
valves, and consequent reciprocal motion of the engine are regulated
without the use of a crank or fly-wheel: but of these we cannot at
present give a minute description. The whole of this apparatus evinces
much scientific ability of the inventor, Daniel Barnum, Esq., resident
at present in this city, and who has received many certificates from
the first scientific men in the Union, in commendation of his
invention.

=A Piggish Parvenue.=

A proud porker, fancying that it was degrading to his dignity to root
in the gutter, came upon the sidewalk, and full of his consequence,
promenaded from morning till night, leaving his humbler