The south-western. [volume] (Shreveport, La.) 1852-1870, 1857-07-15

A New MoTIyE PoWER.--We have been
aware for some time past, that Prot. Saloman
was engaged in our city constructing his patent
"sulph. oil carbonic acid engine, and that his
prospects Of success were highly encouraging.
More than ten years had the professor labored
upon this fayorite theme of his mechanical and
scientific genius, occasionally encountering diff
fcultes, but by close application and unbend-
ing enterprise, be has finally found his efforts
crowned with abundant success.
We called yesterday afternoon much to our
qualification. and saw the engine in full sue
cessful operation, where it had been working.
without interruption several days, in Cypress
alley, between Pratt and Lombard streets.
This engine, being merely model, or expert
mental one, has Of course some imperfechons,
and may be greatly improved, but it is calcu-
lated for four horse power, being common
rectilneal orreciprocating steam engine, differ
ing in no material respect from those in gene
raj use. The patent novelty consists in the
motivepower AMI its application, which wholly
supercedes steom. This motor is produced by
a compound Of de. sulphiated bi. sulphuret Of
carbon, coal tar and volatile, or fixed oil. which
under certain influences Of heat, becomes pow
erfully expansive, and thus gives momentum
Though only four horse engine, it was per-
forming the estimated duty Of ten horses, and
has been doing so since put in operation, near
" fortnight ago.
The fluid OF. gas, constituting the motive
power, is used ever and over again without
much perceptible diminutIon or waste-being
thrown, after performing its work, from the
heater into the condenser, and from the con-
denser to the heater again, with thorough rem
ovation The heater where the gas or fluid
is introduced, is submerged in cistern of oil
kept hot by gentle fire. In this condition the
gas expands, gaining its power, and passing
through pipes and valves, acts upon the piston
giving motion TO the engine. The appliances
are simple, easy of comprehension, free from
complication, ard not subject to accident or de-
rangement Thus steady active force is kept
up at all times.
The cost of this fluid is estimated at ten
cents per gallon, and it is estimated that eigh-
teen gallons b. careful attention, will run an
engine of the capacity here mentioned for one
year. It's components are such as not to freeze
at ninety degrees below zero. The amount
of coal is in the proportion of fifteen pounds
W Ouc uuuuICA Will tiC
common steam engine of the same dimensions,
whilst more than double the force can be put
in requisition. The engine which we saw in
operation has & piston of twelve inches stroke,
crank six inches. 1t was doing the work of a
ten horse power, under the break Of a wheel 8
feet in diameter, 8 feet III inches in circum-
ference, pressed between two bars one on each
side, and a friction bar of y inches in length,
and 2I inches in width, on an iron rim of 2JJ
inches, under q weight of 1l2 pounds, making
80 revolutions per minute.
To those versed in mathematics this will in
dicate the engines capacity, or the power ap-
piled thereto by this wonderful agency. The
heat causing the result here noticed was only
237 Fahrenheit, OF 60 pounds working power
under exhaustion, and an atmospheric pressure
adverse, which adds that much to the active
agent. By trial with steam in the same pro-
portions under similar condition, with 267o
of heat the amount of pressure was only 25
pounds to the square inch, and when tested the
engine moved but slightly and then stopped
Thus there is clearly demonstrated an almost
incredible superiority in favor Of this new me-
tor its application over steam. Besides, the
advantages above noticed, we are told-and
indeed, it becomes apparent to practical or sci.
entifc observers-that explosion is impossible
and thus a momentous point is gained in obvi.
ating all danger. baltimore Patriot
JUDGE SToRY's OP1N1oN-The Buffalo Com
mercial Advertiser relates that in the opinion
delivered by associate justice Nelson, in the
supreme court of the United States, on the
Dred Scott case he quoted very remarkable
letter written by Judge Story in 1928, relating
to case analogous to that of bred Scott II
seems thatjudge Story was accustomed to write
at least once year to lord Stowell, sending
him a copy cf his judicial decisions, which the
latter duly reciprocated. At length case
arose in the English court, (of which lord Sto-
well was chief justice where an Antigua slave
was carried BY his master to England for tenn
porary residence, and was subsequently, taken
backto Antigua. He brought suit for his free
dom, and the inferior court decided against his
/ right to freedom. In the appellate court, lord
Stowell, in behalf of a majority of the court
affirmed the Judgment below. Lord Stowel
sent his decision to judge Story, who delayed
replying 50 long that lord S. again wrote tc
him, expressing regret at not receiving areply,
and hope that their pleasant correspondence,
of so many years standing, would not cease.
70 these letters Judge Story replied as follows
"sAIEM, (near Boston, Sept. 92, 1925
Rightho VIM. Lord stowell-My lord: have
the honor to acknowledge the receipt of your
letters of January and May last, the former OF
which reached me in the early partof spring,
and the latter quite recently. I have read with
great attention, your judgment in the slave
case from the vice admiralty court in Antigua.
Upon the fullest consideration which I have
been able to give to the subject, entirely con-
cur in your views. If had been called upon
to pronouncea judgment in like case, should
certainly have arrived at the same result, tho
I might not have been able to present the rea-
sons which led to it in such striking and con-
vincing manper. Itappears to me that the de-
cision is impregnable.
In my native State( Massachusetts, )the state
of slavery is not recognised as legal; and yet
if slave should come hither and afterwards
return to his own home, we should certainly
think that the local law would reattach upon
him, and that his seryile character would bere-
integrated. [ have had occasion to know that
your judgment has been extensively read in
America, (where questions Of this nature are
nnt of rnfrenYcnt diccuScion and never ha yo