Martinsburg statesman-democrat. [volume] (Martinsburg, W. Va.) 1906-1921, 1912-12-27
PACE THREg.

remote from the main switchboard.
When this awitch Is thrown the car
starts slowly from under the crlshef
then passes with increased speed up
the incline automatically slowing
down al the top. discharging its load
slowly over the screens. Ia case Oh
any accident IN Ia operation or rum
ning of ,car past It's proper terminus.
automatic safety brakes are set, stop
ping the car instantly.
Instead al revolving power screens,
The Edison stationery bar screens are
used. The screen IL a series Of paral-
lel steel plate bars set az proper angle.
There are three sets OF these. and the
stone IL dumped from the skip hoist
car on tho FIRST screen. thence falling
70 tho other Two sets The larger
aux stone passes over che screens i'm
Ia the storage bin. from which It ~
loaded through chutes into the rail-
road cars. The 20 inch stone aud
smaller sizes drop through the screens
and are carried by Robbins survey,
or belt to other stationary perforated
screens, which separate this stone In
Ia ballast and screenings,
The entire plant Is operated by cleo
trieity. The power IL generated hy
waterfall on the Shenandoah river, -
miles distant by Winchester corpor'
ation and sold NJ very reasonable
cost TO the National company Tho
current comes into the transformer
house with $4,000 volts. and Is there
stepped down ii three oil transform
era 10 40 volts for use Ia the plant
motors. All tho wiring IL IN iron con-
duiie. avoiding exposed wires, with
their danger OF fire and life In IN"
plant are two 200horsr power motors.
ono as. one 50, two IL and one
horae- power. or a total OF seven mot
ors. with three switch boards with aus
tomato control magnets. The motors
are General Electric. while the trans
formefhouse Is Westinghouse the
quarry skip cars are automatically
ed lnfe the hopper by an Otis
Elevator Go. electric hoist. The
.loks OF these cars were made by
he American Car q Foundry Co. aud
the he'd or skip by the Robert New
bold Company
The National Limestone Co. owns
ever 1900 acres ef land, estimated, az
Ter diamond drilling Of the area 70
contain a6 100000 tons OF lowsilica
limestone aud a00oo0,0oO tons Of lime
md ballast rock Most Of the lux
stone Is shipped Go Pittsburgh, and
snme even into Northern ohio.
In both cf the present quarrleH
/ Cameron pumps are used % keep oiat
lthe wafer In The larger quarry .
pump runs day ana night. with 4 cost
inch discharge keeps the deep hole
! practically free from water This
pump runs day and night. hith a cost
icf repairs ID over year run OF only
Ia few dollars. A smaller Cameron
pump Ii lsed Ia the other quarry.
Whom the skip ear comes from the
quarry ID the crusharhonsa Il II stop
ped at side OF hopper and The hoist
cable Is hooked 70 one side of the skip
which III raiaed and tipped Into tlaa
/ hopper BY an Otis Elevator C0 electric
automatic hoist operated by SO.
I horsepower motor After unloading
4 4 reversal OF the machine drops the
skip back Into place on the car truck.
A i5.ton load Of stone "a unioaded and
skip set back IN place ready for an
other cur IN one minute.
\ The steel worl, of the buildings WIS
/ erected by the w w Lindsay Comp
any. Of Philadelphia. The plans were
supervised by Ladd 4 Baker. engi'f
ss;rs of Philadelphia.