The sun. [volume] (New York [N.Y.]) 1833-1916, 1894-04-22
xorrs ON SCIENCE AND INDUSTRY.

chine mas etght-foot wheels and carries an
s-ineh saw 50 feet long. and the form and
SpSon Of the SSO%p :pa ,s
shaft are such that there IL no danger what
ever o. any vibration; the back .suppor!lps
strong boxes sseursly boltsd to the main
column; the bearings in which the shaft rests
In addition side sdjustms nts, By m cans Of set
shsit. also a convenient vertical sdjustmsnt
Wheels. and j. here taken up 5T the vsisht.
the lower wheel shaft are also trunnlon bear.
ings snd the rack bearing ha. an eflcient
:r; Il: ss 81 int sane e
in cutting good iumbsr: and the uppst euiis
connections. arranged for rapid and sG.etivs
work.
In an elaborate paper on the various sys-
tens In vogue for furnishing water supplies to
towns. Mr.. J. L. Fitzgerald expressed 10 as his
opinion. before the Am erican Society OF Civil
Eneinee-s, that. whatever the size Of the town
gravity system OF supply IL preferable when
ever the following conditions are all fulfilled :
supply Of unauestioned present and future
purity quantity sufIlcisnt for the needs Of the
outlay. and the original cost such that eight
per cent thereon IL not In excess OF sixty DER
cent q the total TOrkins expenses, Including
the town H. large enough to take half q million
ply IL good and abundant although found at .
low Level and when there are no great differ;
II there are highly elevated portions Of the
same district, these II mall. are best supplied
from separate reservoir fed by a force main.
half q million gallons daily, direct pumping
with a reservoir OF At least twenty hours
H. the most economical. and when a town sup,
ply is intermittent oil course q reservoir
ca paclty sufilcient to afford the requisite
The new method introduced in France Of
manufacturing alloys OF iron and copper con-
sists slmpl in producing an alloy OF castiron
and copper. and subsequently, using this alloy
to introduce given amount OF copper into
crucibles Of open hearth steel. this being done
by charging the furnace with copper. scrap and
cast iron. making an alloy OF from to - per
which It lie to be empioTed. the product being
remarkable. 1t 10 said. for its great elasticity,
strength 5Gs tsnasisy and mHlleasi,isy properties
by chilling and temperinr. This alloy is
charged into the bed Of a furnace with tho or
OF steel, the steel thus produced generally
from two to four per cent Of cop
The very dsSsse
strength aud Suitability. The stsels aiIoYed
with COPPER are said to be especially useful in
gun barrels. projectiles. or for comm srcial
sheets. bars. and tina like, and may be obtained
or Silica .seoad1S 70 tho dssfsc u Ssrdn.s
required and purpose intended.
Among the various mechanical operations
In which pneumatic power IL now applied
with special advantage as compared with Or
dinary methods. those OF calking. stone cut
ting. &c. have become prominent the ,cono-
my VI time and labor In these industries thus
gained being quite marked. Rotary cutting
tools driven By compressed air have been used
to considerable extent By stoneeutters In
this country and In England. both stone out
ting and the calkiDg Of shin and boiler plates
c srsc very iftgey done BY tools Of similar
genious tool Is used, a vibratory bach. and:
per minute: the motive power is compress
ID air At 2 pressure OF forty pounds to the
r. tSe. N IN
'or which i Is intended. and very rapia mo.
~, the length Of, the stroke Is only about an
:siFine tool. which Is held in position be be-
springs. the execution being very efficient
a, torho.,s ,..sa,,n $50. y. ,%e
VI to"ooate. As fseentiy tested In
England. namely. that OF driving three screws
With two triple-expansion engjnes. 4 high
,ov.r "a ...ur.d NO. .,,.,n.hi. .m.,..n.
eN NV e's'hsoio oineionuy
through two screws restricted as to depth Of
m IMMERSION. In this arrangement the centre
m rthsr forward, ths eant,sI .na 81 er, osing
he tSo ~ anr .n1 oonsi LII ssro"ns tuuneu "
,cpaw. hnus anu she nluo
.yiinds,. y, III. hiMnatn u ahsermeTTihato
he stasm tsEen I'M hnnasd ins
PRESSURE Cylinder on each o, N. LII
hats. sxhausting into its own informed
~ Si Hns sae nAiI tnen INTO the low; pressure
an be worked independsntIv thnnshK M
highest efficiency Is attainable only with the
yhole system in use The plan Is to en- ploy
he low-pressure CYL nders. with low pressure
team In leaving harbor. where the fires have
'ssn banked and pressure is not up. mod
rate speed is thus attained without delay
low. Scotland. for the purpose Of manufactur.
nc on an extensive scale the improved Sand
q guiding machine, already noticed As an
INVENTION due to the Ingenuity of Mr.. Leader
ornpo n n ~ ouId -. - a.. -.