New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1856-05-27

tie present envelopt hat the gum nsy lie nro.sIenec
anu lie ls,ter opened without discovery. Waier'
may be soaked nearly a. easily, and wax - liable 10
melt IN ho; climates. In Mr.. knights inventor
tte more paper s rs d. snd he Gaps being locked 10
g,ther by specss VI devastating, in addition ID TIE
gum. q metallic clasp ey,let i put through the
lower por' on YEAR tie edge which recuqlly secures
the whole pe, kage. An ,slct through letter folded
N the ordinary manner would not only prevent rs re-
moysl from tie envelope, bU; would interfere With It's
unfolding when prolcr! oPeued. To AVOID tbs DIM
Guilty tlr paper 10 be fcdrd Nth ~ edge pro- ctng
and til. edge rather than he folded portion, l. allowed
10 receive the eycle,. b. this arrangement tue -oak'
ing W tearrg open OF the usual Zap Of he envelope
do. not release the letter. and tn, process required
tearing or cutting around three sides OF the on
,.lope si.er which i msy be opered Ike the c1ver Of
a box. and the cortent5 uniolded. The letter thus
cot. On fc carving the envelope WITH It. a. test
uoDy q the time aud place OF maog, and Also OF any
instruction returning, etc which oAen might render
such a matter of importance. We esteem tbs en-
y,lore matter Of considerable value 70 large pro-
pcrtiou of the business community.
MARTIN, VERTICAL TUBUL,R BouFH.-These
boilers, invented by u. h. Martin, the present
Epgineer-iu. Chief Of the Navy, the leakage Of
which in the new war-st.smer herrnlac, hss
be,p much commented on in the newspapers,
aye very similar 10 those III Use on the Coiins
and several other steamers, except that the Tubes are
less e1po.ed 10 intense and deeteroue seton of the
fr.. The boilers appear 10 be very popular. having
been adopted in the nailsteamer Fulton, the nam
me,h new Collins steamer Adratlc all the new Gov
emmett stesm.fricates the varstesmer Susque-
hama and Others. The essential feature OF the boiler
the arrangement of the tube box over the furnace,
90 that tie tube. AXE the return action Of the fire,
instead Of being. as heretofore behind the furnace,
and exposed to the direct sctiOu' OF The flame.
The tubes are brass. without seam being drawn from
brsss ngots by the American Tube Company, Boston,
AID are generally about two inches in diameter. The
water pa.ses through the tubes and the IRE around
them the tubes in all standing upright, or nearly
So aud measuring only about three feet in length. The
economy of boiler depends on the amount OF water
eyaporated OF changed into steam by each pound of
coal burned. In an experiment with the Susquehsnna
70 test tb;- point in March last 2s,372 rs of water
was evsporated by 1900 bs Of anthracite or g, l37
b- of water to n of fuel. This i very favorable
resuit in comparison with other marine boilers.
QUARTZ MIsIsG STlrsrrcs-The late report OF Dr..
Trask, state Geoogist Of California, gives the whole
nun b,r of lis now in operation 3d. Eleven quartz
mines produced in l-5i ~ 7aO eighteen produced in
1855 e. 80 l6l. Total in two years t3,ol69'l. Ot
rome other mines he had obtained the product conf
dentiaIy and estimates that the aggregate products
of the whole 80 would fall but little short of six m$
lions
ExPrgSrsr- WITH AIrWsrr. -The discovery ola
new metsl by NJ. IIlsre Deve, 10 which he has gwen
The name of Aluminium has created the greatest
excitement in England. This new silverlke metal
furnishes ouly under the action of mixture OF nitn;
and sulphuric acid II Is a. ma leable az gold, aud
can be drawn into a. fine wire rs silver. II can be
worked with the turning lathe and the file. and IS
precipitaed from solution by galvanic current OF
bsscr me- tall elm yng to il as tenacousy a. silver Its
.peclc gravity Is 20 -mG that does not sink in con-
certra;ed nitric acid and has at last been discovered
that conducts Il current OF electricity more per-
ft,t.y than any other metal From these precious
properties the Importance OF the discovery to all work
err in metal may be imagined. All that is now neces-
.ary Is TO discover cheap method Of extracting the
metal. The process has been that ciyolite was re-
duced to powder. According 70 BerzeLus cryolite
IF.