Evening bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1895-1912, 1897-11-19

varied uses to which this power is
now applied, such as in drilling,
in mining and foundry work,
pneumatic gus, pneumatic tubes
tor sending mail and parcels, at
teDtion will be confined TO it's use
for municipal purposes only. The
first compressed cir com pany in
Epgiund was started in Birmiug-
ham on very large scale; the
first in Europe was started IL Pa
ris. A short description of the
work done by compressed air
furnished by the Paris company
will answer for both. Originally
started by Victor Popp, the iui'ia
tor OF the s. stem Of operating
docks by pneumatic power, the
company bas been so successful
that 1t has since been doubled and
quadrup'ed in power oud extent
aud the demand for the coinpsny's
air inc eased faster thau il coull
supply its customers. Hundreds
of private Installations are work~d
With it. The Paris company dive
nine electric light stations, the
electric lighting Of four thenters,
ten cafea aud hotels, the printing
of the Figaro and other new--.
pape,s and operate nsarIy 5000
clocks, etc, etc. The air is car
ried in pipes under the streets Of
Paris aud form a perfect network.
These works have aronsed the in
torest of scientific people all over
the world, aud they are beiug
duplicated in macy places.
Compressed air applied to street
railroads was first introduced op
the Continent in the city of
Nantes, France, and has been
giving excellent satisfaction ever
since. The Mekarski high pres
sure system is used, and il is the
system preferred for long dis
tances and infrequent trips. In
brief il consists of motor cup
piled with several cylindrical re-
ceivers for storing the air at the
high pressure Of $50 pounds pc,
square inch. These receivers are
placed under the seats between n
the wheels OF the cara, end carry
enough air to run the cars at a
speed OF eight or ten miles IN
hour for a distance of about
fifteen miles, when they
are connected with the main or
storage supply and reflled, an
operation lasting only few sec
"nds. The cars are qnite heavy
1T the start but become much
lighter es the air il used. Those
in use at Nantes are very heavy
machines, weighing about 10000
pounds un!oadea and carrying
sixty passengers seated.
There are several other high
pressure systems in use, bat all
seem to have the sana objections,
they al require great storag'
capacity, their machines are bul-
ky, originally costly md expen-
sIve to operate and maintain.
All these motors being charged
With pressure impracticable AS
working pressure, a reduction il
made TO about 100 pounds before
the air 10 admitted to the working
cylinder, SO that loss OF part of
The energy occurs at the outset.
Another loss occurs from The me-,
cessity OF cooling the air which
rises in temperature ss it is being
compressed.
The Pardy low, pressure system
consists in employing number
of light weight motors supplied
with receivers 10 contain about
fifty cubic feet of air at l0O pounds
pressure per square inch. These
receivers are placed on the cur
aiihCr on the sides, overhead ov
under the SEATS. Ordinary loco
motive engine cylinders are Car
rled under the floor of the car nna
are made directly with
the car axles or wheels. There is
IN underground pipe placed be-
.wern the up and the down track, 1
four to fix inches diameter, RIM
ning the entire lpngth of the line.
At every $50 feet a branch from
his pipe leads to the center of
'ach track, these branches termin
,ting in peculiar form of u vsiv-
I'd outlet two and one-four,h .
inches diameter opening at tho
street surface. There is flexible
IGZzle carrie d on tie car connect