New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1859-04-12
SCIENCE, INDUSTRY AND INVENTION

patented By Perry G. Gardner Of Ses'forf. faie
mon is .oftsned by heat bat does not melt hence
i. ,hsped into tools and pieces Of mschiney by fors
ing, sre costs from II 10 - cents per pound Ce''
non which il q combination Of ron with or per
cent Of carbon does not GOTTEN BY hest but ct GER
tain ten peratur. suddenly mets; hercs IN. meta
IL worked into useful shapes BY casting INTO mfld',
aud costs from TO cents pei und sieeie iron COM
bred with from TO per cent OF carbon In metal,
when heated to 600 degrees Fair, becomes SOFT Ano
csn be forged ard welded; heated 10 s oo degrees
melt, and car be poured into mods The Ordinary
moce Of working steel By forging. and sc es m'oe
Of steel thus pr. pared coat from - to - GEMS per
pund. Many have attempted TO make these ahciss
by casting into mods. but they were unsuccessui the
metal Gas not as tough % sftsr being hammered; DE-
,idsi zone cir remaining in the mold and nixng s'n
the fuid metal, produced those defects techricau!
c.. ed honey comb and piping. Mr. Gardner seems
TO have succeeded in overcoming the cltheuit'ee DIS
process i. a. follows Molcs Of hreclsy or black ssd
are repaired substantial frame, 20 Sc TO % used
great number Of times. Esch mold communicates oy
.tr.isht vertical pipe with an air cb amber placed
above it. ard tbis srcbsmber elosed ~ valve on
top operrg out.ide By the eide Of the mold bat on
higher level iss cup, from the bottom OF which
curved pipe leads to the lowest portion Of the mold
Ire OItLlIE VI PAP0 An NNF - N-
by . pug. Esch time this mold is to be used
II !. fret heated to cherry hsst-.hst H.
from 1900 to $500 degrees-in proper oven
TIE air contained in the several portions Of the
mold to about fifteen times it, final bulk, and
IN 20 dor escapes through the valve at the top OF the
al rhsmber The mold lie swiftly taken from the oven
b. melted steel poured into it. aud it s replaced in the
oven til the metal CONCEALED snd brought down to
ctery red. From the shape Of the mold it results
that the melted metal entering the mold from below
pushes cut the small portion Of air remaining with
ont mix np with it. a. for the few bulbs which might
have erteIed the ,teel when falling down the pipe in
s wsy from the cup TO the bottom Of the mold it ia
very little and al collects in the s2rue formed IN
the pss,sge TO the air chamber which is after~ard
broken of. After the metal lie CONCEALED, It is taken
from the mold ard plunged into oil at l5O'. This
hsrdens II TO the right point and the articles do not re-
cure temperpg, beeide being smooth, without crack
pe or warning Mr. G. has exbibitedto Us various oos
made by hi. process, which appear fully equal to sim
liar ores made by forging also, several bells, with
Gle Ar .yery sound and much lighter than when made
of bronze which be offers at % cents pound, making
alage profit at that price. We should ike to see
th, process spilled 10 tie manufacture Of couters
and points for plows 1t would psy well the manu-
fscturer and be boon to our farmers.
HowEs WEIGHING SCALES, patented by Strong q
Bn,.-The principle on which all platform scaes are
built consists in mskirg the platform rect on the short
end Of the first Of series Of levers, and in balsnc
ing it with small weight the long arm Of the laa
lever Az the multiplication is great, 30 IL the iDtu
epce of friction hence such scales aie entirely worth
less uness the fucrums and joints constructed to
roll easily In Howes machine two parallel shafts, one
under each end Of the platform, are placed journals
attached TO the frame of the machine from each shaft
lorg arm extends obhqusly 10 the side OF the plat
form midway between the ends where they connect
with small lever above grouod, to which the weights
are Suspended. Each shaft is also provided with two
short arms, ore at each end, ard on the side
oppotis to the long arm. Thete abort Arms END
in the form Of knife which is placed an iron plate
with two cur shaped receises ia upper surface in
each cup lie an iron ball, ard the platform provided
with corresponding inverted cups rests on the eight
bsl, This does not require brscing OF tue
lor levers arr works beet with weak flexible plat
form which adjusts itself to rest equally on the four
knives CoDseqasrty the instruments are lghterthan
usual and being also Lass bulky require pit OF small
depth, which is in many casss OF treat advantage.
GOVERNOR yALvE-Psterted April, 1853, by La
Frsnce-This valve il large faucet, somewhat SINH
lar to those which proved ,igral failure on bard
the steamship Adistic. Our readers will remember
ths', when the steam let in, the lsVisthan plugs
expanded by heat and stuck fast. To avoid 'nilAr
re.ut ard s,o TO prevent the plug wsdgng itself in by
pressure of steam the conica holes around tue plug
are cut with four openings corresponding to tbo'e tue
plug and bets cen them four receses in which the
ste an has free scce. BY this arrangement the pres
cure of steam inside and top is so nearly eqail
brated that the friction is inconsidersbe, and the
rsme Of .tesm fostirg valve is justified
DOUBLE CIRCULAR SAW MnL-PateDted by r.
Egglestop, Mobile, Alabsms.-Two circular saws are
60 arranged on sliding frames as to be made to ap