The sun., 1897-09-05
xorrN ON xc1nxor AxD ryDUsrnr.

An Increasing uss is being made In the West of
what Il termed "compo board" which 10 pronounced
superior In soma respects TO Rths and plsstsr in
the construction of inside walls. one.lnch boards
hre ripped into strps Onequarter NJ inch in thick
ness AMI four feet in length 1t taksa but little time
thoroughly to eradicate all o,ature from tn s;ripa
AMI they thob pass through mao hins in which.
they lie soldy csc 10 edge they arc covered too and
bottom With specially prepared building paper
which Is senentsd with An iusoiublo coulnnt, with.
out further manipulation the boards nailed upon
he studdins Of the building In process erection
forming solid wall. Witch is now rcady for any sub
segment treatment desired. This compo material In
hauici hy the csrp"Lt~r rAthcr than the plAsterer
and Is said to constitute satisfactory ahcathng not
only Afr tight. but also stiff and strong enough to
take the place ot iAh boarding while abb ne the
complete finishing Of the wall without piastsr.
For the Industrial application OF the new eieotrie
bleaching process, an improved apparatus has now
been contTved OF peculiar value. 1t would aeen for
the purpose, Tho cotton yarn Ia very closely packed
Ia strongly concentrated liquors pr-par in vessel
through which flows solution of rock .alt while at
the sans time electric current from dynamo
machine circuiRes through the liquid the bleaching
liquid obtained in this manner being kept In closed
vessels unui required for uso. me aivantasea
claimed FOR this method tho most thorough and
unturm bleaching. and. compared with tho use Of
bleaching powder less liability to "tender" the cot
ton and there Il dc"reaseh cost Though the initial
eKpond tur- IL somewhat larger the cost OF working
Is low. Two operators bleach In this way and
wash on somo fifteen hundred pounds OF yarn q day.
1t 10 noted. however, that wster supply which 10
quite unsuitable for bleaching by the ordinary pro-
cess is equally 30 for this.
portable motor and dril. with magnet, for use IN
iron and steel plants, where heavy castings and
forged pieo-s must he transferred from one depart
meet Of establishments TO another IA described by
DR.. inuis Bell in the Engineering Mdgartns. The
motor 10 provided with worm.dr.ver drill together
with unirorsal mounting OF four adjustable feet.
When placed fairly ships plate other mass
OF iron these drills have adhesive force OF nearly
half ton each. The drill can DO adjusted and
clamped by the simple turning OF a key. and 10 win
bora holes VI 60 an inch In diameter fast Il
bc safely worked. The whole affair Ia of only about
goo pounds weight. Another convenient application
OF this prnciploi is reported In tho works u
the Illinois Steel Company In the rolling OF boiler
plates tho resulting sheets twenty more feet long
| and weighing from quarter 20 half ton. are of
courc di1lcut to handle. and, when to DO moved aro
objects vory difficult or inconvrnient to sling. To
meet this difficulty pLir Of powerful electro mag
meta were rigzed up and attached TO Travelling
oran- that all that s now uired 10 to drop those
magnets do~n upon ono o! the long plstoa which Il
thus held at two convenient points, and TO send
rapidly down the room, dropping 10 into place with
out jar.
The compilation OF the great Backw all tunnel under
the Thames London and its op-ung public tran.
ait arc events Of email importsnoe In the history
OF that metropolis The revised and ufo,ai ata
OF this immense engineering structure follows:
Til. total length OF tho tunnel and its approaches 10
5000 feet ana It is lighted by 200 amps OF 82-aandls
power, gs being admitted TO any portion OF the
tunn-i. The number OF employed 800
and 1900 tons OF cast iron osod 1000. 900
tks. 100000 white glazed tiles. $4,000 tons of
| cement, Il loooo tons OF concrete, OF
phalt, and i2 milen of electric liRhe cAhlon ThA
total time occupied in the work has little moro
than nve years " hile the specd portion under the
Thames covered . period Of almost artly twelve
months which Is average rate OF 100 feet month
The contract for the construction OF tunnel was
taken at 1900 but the actual cost OF the whole
has been nearly seven and half millions.
| That metals no,t on tho surface of water was
| proved not long ago in Interesting manner By
Prof. A VI. Meyer OF the Stevens Institute o, Tech
n"ogy. HohoEen. In making th-so experiments
AT frs ring OF Alumni num nfty milIim-tres in d
ster was used made ont OF wire ono mllimetrc tiok
and II noated the wnter; gradual additions the
we Sht OF tho ring being made. Il sank deeper and
heeprr IN depression IN the water. until. having
reached depth OF Ave miimetr-s. II bruke through
tho surfac- the total weight required mako
the ring br ak through the surface teing 80 grams
| Further experiments showed thas all metals
| with clean surfacea from platinum OF o density
| OF IL. noat water The fact was made evi.
|
| sink when their surfac"s aro fre'd OF air.
| aud that after the MIN Of air has recondensed on
surfaces they nostthat is In the nrst tho
Eetsis arc weued. and in the second they it
being titus evident that the dry surface Of the wire
between the two opposite depressed surfaces Of
| could NOT exist II the water wetted the wire it
| would wet ring made OF clean glass. At the Same
time. Prof Meyer remarks, though the water does
not wet the wire It vets KlAsa, yet tho IL
attracted by the wire so a. TO sihere TO Il with such
force that IL can take the curvature required TO with
stand the inw ard hydrostatc pressure che do
prrssed water surfaces.
ino .Aiue ot '"e pA'' '"Hus'I' last se" On 'ns
."es' "." o., VI '"e oN,' :" 49, Ne'o'" A'a'un'eu "
o'''' ''' 7 s APN "a 'oin' Nv .
'Aou'Anu 1 'o"s ~ -. "'u">e s"'t' 'n' '"ue Vi n'ch
Tn" pearl nshug. with appurtcnAncrs. forms the en-
tire occupation Of the native population. and La Pas
which 10 the capital for this trade in the peninsula
e1ists exclusively upon this Industry. Until few