Richmond dispatch. [volume] (Richmond, Va.) 1884-1903, 1895-05-28
SCIENCE AND INDUSTRY.
Superhcated steam-Improvemen
I'm the Photograph, &c.

New York Times)
A recent contributor TO the discussion
on superheated steam argues that In the
long series OF losses occurring in the la
tent power Of fuel burned under steam
boiler, one Of the most important is that
which results from condensation in the
cylinder; one OF the devices resorted to
in order to lessen the waste being to sur
round the cylinder with a chamber In
which there is live steam, thus maintain
ing the heat OF the walls Of the inner re-
ceptacle, and another is 10 let the steam
do only a part Of its work I'm the first
cylinder and then enter q second, and
perhaps, a third and fourth, before It's
energy is all utilized. Besides using a
steam Jacket and compromising the Ell
CINE, II has also been proposed TO super
heat the steam before making IL drive a
piston. Steam taken right or from the
water In n boiler has only the temperd
ture OF boiling water, in this condition be-
ing said to be wet or saturated. and the
slightest reduction OF its temperature Is
attended with partial condo nsation; but,
II the steam be let off into another YES
sci and there subjected to higher heat, Il
can undergo contact with the cylinder
without the same liability 10 condens--
ton and loss of power. IL is, therefor.,
urged that there would obviously be no
economy II II took too much more fuel TO
do the experimenting or, il the apparatus
were very costly though by so arrang
ing the superheater that what would
otherwise be waste-heat may be utilized
there is a net gain in work performed.
To free copper-plates from gold. the
Mining Press says. they must be put
over charcoal. coal. or coke fire, slowly
eyaporating the quicksilver off them.
Where admissible, the fireplace OF
square boiler may BE- utilized. using thin,
red fire: then, after the entire evaporation
OF the quicksilver. the plates are to be
slowly cooled. rubbed with muriatic acid,
and put in a damp place over night after
ward rubbed with a solution of sal am
inOnIac and saltDetre, and again slowly
-T6dtl1 over q red fire. They are not -
be allowed to become red hot, and when
the proper degree Of heat rs reached the
gold scale will rise in b.lsters. at which
stage the plates are TO be taken from
the fire and the gold scraned OF. any
part OF the plate on which the gold has
not biistered to be rubbed with the solu-
ton and again fred The gold soales
should be collected In an earthen dish and
covered with pitric acid until all the cop
per is dissolved. and when the god can
be smelted in the usual way, though after
I is melted corrosive sublimate IS 10 be
put into the crucible until a blue dame
ceases TO be given off.
According to the Revue lndustrielle, NJ.
Koitzow's Improvement in the photograph
consists primarily In using for the cylin-
der, instead OF wax covering, a hard
Kind of soap. cast in brass moulds, the
advantage claimed for the soap being that
OF retaining the impression longer than
wax, and OF not being subject 10 soften
ing in hot weather. The construction or
this mechanism presents the additional
popularity of recording the sound TO DC
impressed on the cylinder by means Of a
sort OF ear-trumpet Of hard rubber, and
this impression Is ingeniously reconyerted
into sound ~ lever having arms ~