The sun. [volume] (New York [N.Y.]) 1833-1916, 1893-03-05
VOTES Nv SCIENCE AyD INDUSTRY.

mlttlng liHnt IN ono Deam n0flEontully, and
now. OF the construction OF n glass apparatus.
which. by reversion. serves MS q diffuser Of
light. Experiments show that the amount Of
light absorbed by ribbed glass is ten per cent.
and by clea. g,nss eight PER cenththat Is, only
f fisRtp per S. fsn.; a' a dsnfi o n ine GGe esmaS SIcs ..
and O fine-ribbed plate Of the same thickness.
f NGw; thfGRSSIhi a RRita'in sl Fla sIrs nS Sit IN tSs 4 sS OBJ.
and the clear sunlight falls ppon the
sSs1sw or M s1n%es viii II e th fsf riSGcd making glass 1 d dSrk
sion. Ia secured without a glare. no window
shades being Fin NEEDED in ina and "lo ,sSrs are are N no , dark
there is obtained n vast deal more from ribbed
in rom c T,anG Glass w' RitS th s" widow .ss sha d no Wick
are required on the south side. This principle
has ,u fr G Sisein app nsder # ,s ss' apc iis 8 f09 sGSs
doing away with glare and shadow. The dis.
IE s"ss to Of bs ,lf Isfa .hsSgsH 81 'G %er r' ssSsi MAS n Ssr |:
zontal pianos to Y per cent. IN plain glass.
The introd uction OF another cement is mem
toned. OF specially valuable properties for
steam pipes. In filling UP small leaks. such as
q blow hote In n casting, without the necessity
OF removing the injured piece. Tho cement in
question is COMPOSED Of Ave pounds Paris
white. Ave pounds yellow ochre.. ten pounds
black oxide manganese. these various inateri-
ala being mixed. with great ,thorouGhness. u
aftsrward added. Tie com position. rs. thus
prepared will set hard In from two to Ave hours.
oha osNSsS 'po u'NNb'uSo VI NV poih sup-
ject to expansion and contraction to such An
extent as TO cause leakage atterward, and its
efficiency in places difficult OF access is of
special Importance.
Tho seRmental wire gun is the latest novel;
ty In the line OF artillery science. tho construc-
ton presenting tho striking feature OF tho
substitution for the usual solid tube in high
power cannon Of anumber ot longitudinals steel
segments. around these being wound strips
OF metal LAYERS Of square steel wire subjected
to a constant tension OF 5000 pounds to the
square inch. and which. SO held together and
the tube otthe gun. The claim made for this
method Is that IN, inner core Of the gun al;
pie to produce, in the larger masses Of metal
The FLOCK is thru thrown sn'' SHen n iof 'tHarslns
it enters tie Ireecl. Ills insures proper
c~entring Of tho threads. under all circnm-
At tho breeth IT the gun the steel segments
are covered ty more than thirty layers Of the
muzzle. ia ienched. The ordinary char & will
generate 10000 pounds pressure. and 10000
pounds ner square inch can DO reached with
entire safety.
Double-tube i~njectors OF an i'm proved system
arc coming into favor. the new construction
being such. it Is stated. that the device works
to the same advantage and fullls the Same
duty under all circumstances with high or low
pressure steam. hot or cold water. water under
pressure or suction. The instrument is a COM
bination OF two steam Jet mechanisms. the first
one proportional for lifting AMI delivering the
water under some pressure into the second
one. where its velocity Is sufficiently augment-
ed to overcome the counter pressure in the
Working t o! the eAl inieetor. at tho lowest estt' as
we'll as tho highest steam pressurcS. with
first apparatus and delivered to tho secopd
steam. SO that the first one acts as u governor
for the second one, The ;cHYplanation Of the
apparatus. which has q relatively small steam
water is delivered TO tho second one under
pressure; its temneratnre can be eorrsspond-
tho boiler above the boiling point.
The peculiar properties OF pure amorphous
boron have been investigated by N. Moissau.
who describes 1t as n chestnut brown powder.
capable OF being moulded under PRESSURE. and
having q density OF . 40: it is infusible even
at the high TEN perature OF the electric arc.
but. heated 10 air to q temperature OF some 700
Cent. 1t inlames and forms boric anhydrids,
whom q small quantity is strongly heated in =
oxygen the powder burns with q dazzlins fame
aetive rays The powder reacts with SULPHUR
| az - NV Vi = >Gl's lfoauSlhSs
brilliant inrandescence: and the s%ulphide OF
boron. seleninm, hrominei and other bodies
slkaiin. metals do not m6ine with il. butit
energeticalIy with the powder, and metallic
carbon; when. for example. a mixture OF cop-
per oxide and the powder is heated in a test
A violent defamation is produced by rubbing
oxide Of lead in a mortar with 1t.
That vast and important public work. the
Siberian Railway. is now in process OF con-
truction-the Daikal line. as it is termed. be-
ing the commencement. 1t starts from the
lourishipg town OF Tomsk. situated on the
navigable river Oh. proceeding from here to
the Government town of Tobolsk. thence to
Krassnojarsk and from here approaching the
Chinese frontier to the left OF tho forest
Tps%' IN rol o. and sr'' "iher v"' 'ss;als IRE next ss
In it's further course will connect with u great
undertaking. though remarkable In it's chnrao-
ter; presents; according &c to TIE Russian engt.
Which have to DO hr5dssd over are ars nut t ew0f 4
crate calculation. 10 placed ut $4,000 roubles
per rerst.
Successful application appears to have been
made in some OF the Pennsylvania mills OF lets
designed with a special view to overcoming
the smoke nuisance. In one case the dini-
Guilty is met BY q Jet somewhat OF the Bunsea
burner type. satisfactorily operating On two
batteries OF nue boilers the Jet Icing placed
above the fire doors and i'm mediat"ly below
the boilers and. though the fu"t is ."iack. yet
almost no smoke IS visible. even dIrin. heavy
hiring. In another ease. steam Tets ola diner,
emit. hut effective. design nave hecn applied
TO pudding and heating furnaces. IN these
tho ash Pill, 10 made tight. the steam and ar en-.
ter below the grates. thc furn&c"S h,ing also OF
the usual tvpe. except tina. special openings
are made for air above the fire and through
the bridge wall. and. when the fire doors mrs
closed no black smoke Is visible while the
steam Jets arc in operation: the smoke mp
pear above the stack waeneyer the FIR? door
Is opened. but disnnpears Immediately. on
closing the door. Each pudd!ing furnace has
two Jets OF steam. And each heating furnace
1--we lets. all ABOUT, one-tenth Of an inch in
dIameter. With this ARRANGEMENT nut coal