The times. [volume] (Richmond, Va.) 1890-1903, 1899-04-02

nre laid. cables pulled ana man-hoieS
constructed" lie replied.
"Au right sir. / have been down in
the mau-holes I'm Boston, Washington
New York and could talk you 10 dehth
on the subject but I won't 90 that on
condition that you will promise me lhat
You Will attend the burial OF th~-oYeihedd
wires when it takes place in this city
ON making the promise ! obtained the
following
should the wires in this city ever be
placed underground. we have the choice
OF i've different systems or suD"ays'
viz. sheet iron pipe, lined win cement
plain wrought iron pipe, coated with as
phalt or tar. yitrihed clay and creOsoted
wood. The last named system has Deen
recently installed in Norfolk. Va
Besides these there IS the Edison solid
tube system. All but this last named
are employed IN what IS known as the
"drawing-in system
HOW TO LAY THEM.
The sheet iron cement-lined pattern
comes in lengths Of about eight feet and
are connected together with ball and
socket Joint In laying this Kind Of con-
duit trench TO the required depth Is
first dug and leveled TO the grade; planks
are then set against the sides OF me
trench TO keep the sides from falling In.
layer Of concrete Is then laid and pack
ed s0lidly in the bottom of the trench,
on this IS laid layer Of the pipe. neXt
a layer Of the concrete. then announcer
layer OF pipe. and so on until the re-
ouired number OF layers Is obtained III
order TO add 10 the strength Of the mass
and to protect il from mechanism injury
the concrete is applied more thickly 10
the top and sides OF the subway IMAM be-
tween the pipes.
A thick plank IS also generally placed
.op1rffe nfgtfct them
from picks and crowbars in tho hands of
Iaborers employed on the streets
This same method is pursued in lay
snc fhe yttrifted clay conduits Plain
iron nine IS not generally laid in con-
crete and Is used mostly for the purpose
of cutting In" subscribers
"'The pine comes in lengths OF about
twenty feet and Is Joined together by
screw couplings having what are known
as vanishing threads
cts sutcess g. principally due 20 its
comparitive choapness and the ease ana
rapidity with which u can be put down
1.-THE mode OF operation in putting down
the vitrlned clay and creosoted wood
varies very little they are laid first on
a foundation OF cement ana after peihs
toined together another layer Is laid on
ION OF the first with the Joints overlap
ming each other. much rs person lays
bricks. thus making practically a Solo
pipe. A. -. Az
"Tbs condults are brought INTO the
,oon-hoies which are situated every 20
or 800 feet. where each line OF ducts
ftops. e.. 81,
,,,rnoqe Of branching the lines. for test
Ing etc. and are OF varying Sizes av-
o-a cling Eve feet square and from -FOUR
20 ten feet In depth. -,
"Tbev are built % brick laid IN &C.
mont with n concrete bottom ana are
covered on the outside with cement 20
n,rvert water and ras from entering
After tho condults are laid and the man
boies bunt the next thing - 70 get INC
cables in their several duets.
"RoDDING."
"where a conduit Is only accessible al
,ts end fn the man.hoie, me Hrot ii'.as
a. 10 get a rope through the duct 10 'ne
next nan-hole. This is done by means
~ rods about four feet long WIN
screw M one end and a screw socho, a,
che other. rod is placed IN the emo Oh
.he conduit and showed forward. sec
ga rod IA screwed 10 this one and also
shoved forward. "a third 10 this and 50 on
san II reaches the next man-hoie rope
&C. then attached 10 the last rod ana IL Is
drawn through the duct by means OF tho
roax TO the second man-hole where each
,od e. unscrewed as II appears
1.-THE cable Is now attachen 10 'hs ~
ana drawn into Inc duct inc ease VIII
ES~ -. u AAna AsnAnAs nnAn sf> 9 -