The workingman's advocate. [volume] (Chicago [Ill.]) 1864-1877, 1873-09-20
SCIENTIFIC AND MECHANICAL.

THE cast steel works of Mr. krupp at
Hs~~n Prnssia. now coveK N area Of 900
acres-larger than the Central Park, New
York city. Nearly 1900 men are EN-
ployed in connection with the works. The
area under roof is zoo acres.
The COMPASS IN IRON NEssELs.-C Cap
tain r. b. Forbes, Of Boston, Mass states
that the compass in iron ships Ill specially
affected in certain localities on the coast
OF Nova Scotia, which accounts for the
loss of steamers in that region. He fur
ther says that in spite of corrections, ap-
piled in England, whereby iron ships may
be safely navigsted in given course ap-
proximately west-south- and east
northeast, when they come to head more
to the north or south by several points on
the American coast their corrections, good
ON the coast of England, are Falueless III
some some ships 1t is well known that
the heeling of the iron ship. the rolling,
the pitching, the conclusion Of the waves,
have an important effect upon the compass
hence, nothing but constant observations
of the sun at noon aIrl the north star can
insure a correct course.
THE National Gdzette makes good show
ing for our ship-building industry. II says
that in the month Of April l66 vessels Of all
classes were registered; in May, l39 in
June, 157, and in July, up to the 10Th day
thereof, ITO. 1t is noticeable too, that
wooden ships are coming IN favor again.
One reason for this ls the cost Of construct
ing iron ships in Great Britain, and anoth-
or is- the partiality of our builders for the
old style. Near Boston, among other YES
sells now building, IL one Of 1000 tons, enc
Of LOCO, and one each Of 700 ana 800 AT
Portsmouth |, 200 ton ship is ready fol
the water. In Maine, there is great activity
in the yards. The rates Of freight are
high. Ships are quickly chartered, and
the prospects Of remunerative season are
good.
bHIP CANAL THROUGH SYRIA &c. +.
writes to point out the possibility If con
structing ship canal along the valley 81 th'
Jordan, the advantage in the route being
the low level, which is beneath that Of tn,
Mediterranean. There il no doubt If the Dos
sibility Of such a work, but its magnitude
and the fact that the Suez canal is alread,
in operation between the two seas. vii
probably deter capitalists from aiding il
the scheme.
Cork JACKETS FoR STEAM BOILERS M
! Chevallier, French engineer, has sdopte
7 cork for the jacketing Of boilers and othe
parts Of machinery. Cork il known to b
/ an excellent non-conductor Of heat, am
these cork jackets are said to diminish th
outward radiation by 10 Q. The cork
cut in the form Of slaves, and these ar
united together by tongues, as in the cas-
of flooring boards, SO that the lines q
junction are protected, while the cor
slaves are easily removed when the necei
q sity occurs. Portions of one of these iacA
|, eta, which had been on boiler at work I,
fifteen months, we're exhibited the 9th,
day at a meeting Of the Paris Society f,
x the Encouragement Of the Arts, etc, sn
were not found to have been in any way
n fected, by the heat Of the boiler.
IRON FOR SPECIFIC PURPOSES TT
% quality Of bar-iron may differ according
. ths purpose for which it is to be employe,
It Wire-iron is manufactured in the charco
forge and the doubling pudding farna
= with iron boshes Easily welded iron
y made by allowing . small portion Of ca
Ii bon to remain in the metal, and BY expe
l. ing, as far as possible, foreign matter b
ae this, by destroying The fire, will make ir,
mo- =. abort II we want ribrous railway
AZ heavy bAr-iron, we must employ a met
nj from which the carbon in easily expelle
mn nm that from the run-Out fires. This is
be Puddled In very warm furnace. WI