The sun., 1900-12-23
NOTES OF ELECTRICAL PROGRESS.

new method has been invented for producing
high vacuums In the bulbs Of ncsnd,scen' lamps.
In the usual process Of manufacture tie lamps are
mrs: exhausted 10 = fair vacuum with pump and
then small quantity Of easolcne or Other hydro
carbon vapor Is introduced and tfe anent is heated
red hot By eecrtc current for few minu'es. both
To drive on, gases that It may contain within ine
and to deposit Uniform coating Of lard carbon upon
IL by the decomposition Of the vhpors. The lamp
Ia then pumped out finally with hish.yhcuum pump
and sealed on. In the new process after the flashing
as II Is called. Of the uancn, de'rminate volume
OF phosphine eas Is admitted 20 the bulb and this
acts mechanically as vehicle 'or assisting in the
exhb OF the residual gssts and sets up mechanical
reaction with either oxygen or hydro-carbon vapors
that may he present, removing thcm very efectualiy
from the bulb. The mechanical pump IL all that Is
necessary in this process ana II 10 declared that II
has resulted In increase Of so per cent output OF
lamps per operator since its Introduction
a turn,ab. for trolley cars has been patented by
an ohio inventor. It is so arranged that when the
car driven on the front whee rest upon two rollers
coming up through the track nnd. by gently starting
the motors these revoye under the car and comrluni-
cate their motion through proper gearing 10 the 'uin-
table ITSELF and thus the car IL turned around by i
own power. the trolley swlveng on i's base and
STAYING on the wire. The ot the car do not have
10 descend from Il and Is asserted that the apparatus
works very quickly aud successfully In practice
Electric train lighting has now passed the expert.
mental stage and bids fair TO displacc other systems
for the Illumination Of passenger trains on account
OF It's chcapneSs and safety. Its the only absolutely
saf- method. since In OF wreck there is no in.
nammnb!e material Such as gas OF oil, " cause iie
In the Hteckage. At The same time, electric lighting
IRON batteries fed by dynamos driven BY the car axle
has proved Itself So cheap that in Austria where TIE
system has been worked out very fully. Il is found
that electric ghtlng cheaper than OIL gas or candles
new variety OF electric FIRE alarm has been pro.
duccd IN which no batteries are used The system
Is Intended Tor small towns and cities and Is very
thoroughly worked out In zach alarm box IL
marne'o machine, similar 10 that used in connection
with the telcrhone as call bell. which IL CONNECTED
with powerful clock spring through appropriate
cams ana levers 50 ht, when the boa is opened by
means OF a key the armatuo OF the nlsgncto
chine receives dennite succession OF short, quick
haiftrrs Each OF these SENDS out over the circuit
in which iAs boz is connected impulse Of electrical
current which may be Of oonsidrra bic power. This
is received in the usual way gongs snc registers
To complete the system an Ingenious line tester
{. used normally when everything is III proper order
all the circuit ls closed but current 10 flowing IN
Il. II this circuit should be opened at any point the
boxes would not work. 90 the tester is used TO send
ou' every two or three minutes a. may be desired.
small impulses OF current 10 ascertain the condition
OF the line. is mechanism IL very similar TO TIM;
OF the box. Upon the armaiure Of a magnetic ma
chine {. suspended weight which Is wound up by
clock work and released At short intervals. THIS
apparatus Is connected into the line and II everything
Is In good working order the resistance encountered
hv the nrnature Of the magnetic when the weight
Is freed causes tho latter To descend slowly. Should
however the clrcuit be open the weight drops quickly
and rings IN an alarm Tor open line.
Arch nj Ro M "A la hear N