The sun. [volume] (New York [N.Y.]) 1833-1916, 1893-10-08
rorrs on sorrcr AND uDUs.nr.

AONAn w nNh~NfF~H~~
ina s,ntement n made that phosphorescent
tubes are being Introduced In England for
practical Iirh ting in places whore beauty 10 Of
more i'm porta nee than very brilliant illumi-
nntion-a substitute for some OF the ordlnary
electric arrangements AEenerntor OF special
but comparatively simple construction is used.
SPIRAL 'V OF thin glass. tube the ends q
which are sbs Ssns n's Is
cSicuatcd.- about one watt per foot Of tuhe
snsSd The IT. that se, MSen nbsny ph %SS
Ga ed they become heated. and the glass is ant
to melt, The light Is never 61i,IIant enough
though where n soit moonlight appearance 10
they are SAD to - pSauSSSSo y so,s sSs Is
ouirei for the vacuum tubes. and this Ia OBJ
famed by means OF n transformer in oil The
s sanSso sss a series with parallel
An improved band saw is now being mann.
featured by u Dover. n. H. concern. some
OF tho features OF which are specially
noteworthy. including an effective resav.
ing attachment. Unlike most resawing
devices. It 10 not lifted bodily from the
table. or raised and lowered by rack and
pinion. but swings easily in and out OF place
on a vertical axis. The feed driving mSchsn.
ism is automatically connected when the de-
x u pr rs sTSaH ~ INV! Which the rolls
stantiy started or stopped. The ,tric.
s sSn ssS p Is an sasan T 9'S
varied as desired between ten and thirty feet
pos ars sf oar naber all 9eared
ss RIGHT af..,s at ps
required distance from the saw. for veneer and
fine resawing work. The entire change from
change OF saws. is easily accomplished IN less
than two minutes AZ band saw II will
clearance OF forty eight inches between saw
and frame.
Nearly a hundred establishments are on.
gagged In the manufacture OF bronze powder
in and near tho cities OF Furth and Nurem-
berg. Germany. The article is composed OF
COPPER. tin. zinc and anthony. melted in
proper proportions. and cast first into rods OF
half an inch in diameter and about three feet
long. these rods being rolled until about two
inches wide andthen cut into suitable lengths
Where wi they are beaten into very small irac.
taken to a suiphuric acid bath, where each
sheet IL washed to Temoys al lpIra rmi rG 1s
sheets ha nS
.Ss pR bsre no ben Hhsr fHap'G 70 is which,
s'ase tie treatment which the metal res re-.
ceiyes whether Intended for powder Or
process changes. II. designed for metal
leaf the further beating Is done By
to the shears, Where they, are cut up into small
particles and become known as clippings
wh fs are I run MY in tatteries enabling one man
to run or attend iitty or more Mh f,a sum.
cienly pulverzed the powder Is n sttted IN
ties going to one receptacle and the inferior
grades 10 another.
A successful system OF producing artificial
ice surfaces has been inaugurated In Paris
and available in large areas at all seasons Of
| the year. AS explained. the machinery con.
sists OF two ammonia ice machines. driven By
two fifty-horse power steam engines: this leo
| apparatus has pumps which force ammoniscal
the gas: which then passes into It; Large rese5.
the tn" S Application %" Of this system for the
saH Of sk IS bs 80 sSf ss n
three miles q eqnnested i'm pipe; thf9uss,
this pipe circulates solution OF chloride OF
passage through, sPirals in the reirigsIatine
grees below zero. The water over the pine |.
thus kept frozen and daily sweeping and
flooding insure smoothness.
An official statement Of tests made ct the
Massachusetts, arsenal to ascertain tho effect
OF temperature on the strength OF iron has ap.
peared. The specimens were heated BY rows
OF Bunsen burners. which wers arranged ina
muffle. and the temperatures OF thu test speoi.
mems were Judged by their observed ezpau.
sions. Each piece was heated to the tenn pcra.
pansion determined by q micrometer. and the
| coefficicnt o! expansion Of each grade OF metal
gan. the TEN perature could be inferred with
| considerable precision. An abstract Of five Of
Fahrenhait Seal0--ia In 0yidenC0 that the
strength Of steel IT, greater at about five
hpndred degrees than 1t Is At , seye1 a..
lively. 90 ;20. 81. 81. and 81 per cent: Of
sample Of steel at the given Temperature BY
~ The result presents the interesting iact
that the oe OF zsr1
them. In fact. showing minimum OF strength
at 21O' or thereah9uts. and maximum Of
strength at about $50.
The new plan for railroads brought forward
In Franco is the subject OF much comment
The system aims to combine the features Of
greatest value in electric and steam motors
for railway lnes-a system which. as claimed
In the account given. can be adopted any.
where without change Of track or rolling
stock. The electric current Ia to drive the
Wheels but Is not to be conveyed from sta. +
tionary machines along the line and 10 /
generated on the train, the locomotive he.
Ing simply travelling electric plant
connective works tho generating dynamo
this furnishing current to a small motor
also. when it is desirable to extend the system
further. to motor on each axle Of The cars
The absurdity OF converting the steam int9
electricity before using the power is declared
TO be only apparent; and the double loss in
thus using the energy OF the fuel Is more than
direct to the nxes. avoiding Slipping OF the
rails and making unnecessary the connecting
rods cranks and wheels. whose Jar and friction
absorb great part Of the motive force The
new locomotive is said to give exact reguia. +
ton Of power and m increase of speed rer
hour. SO 81 miles. without change OF roadbed. |
A series Of Investigations have for some
years past been made Mt the water works OF
the city o! Zurich for the purpose OF testing /
the effec. OF filtration at various rates up 10