The Maryville times. (Maryville, Tenn.) 1884-1944, 1885-01-08
Scientific.

pipes can be made by mixing one
part sal ammoniac, two parts sui
phur and eighty parts iron dust,
and sufficient water to form a paste.
An oil for betting is recommend
ed, which consists Of nine parts 81
linseed oil and four parts litharge,
ground in water. These, boiled by
an addition Of turpentine, furnish
an oil which possesses, it is said,
many admirable qualities.
To write on steel, first clean the
steel with some oil vnd cover the
surface with layer Of molten bees.
wax. A sharp-pointed stick is used
to write on the wax, SO US to lay
bare the parts Of the metal which
have 70 retain the writing. The
pdrts thus exposed are covered by
means OF o brush with q mixture OF
six parts nitric acid and one part
acid. After Ave minutes
the metal is placed in water In or
der to stop the further action Of the
acid mixture. 7ets
Two methods are in use in Phila-
delphia to prevent chemical OBJ
structions in water pipes. One is
h coat the interior OF thu pipes with
cosl tar pitch, which doss well
enoes h for largo mains aud keeps
the passage tOlerahly clear fpr more
than . quarter OF q century, The
other method is the one called
at.ower-barff,n which consists In
subjecting the pipes at q high tenn.
pcratnre to the action Of steam or
air, so that there is o Aim Of mag
netic oxide acquired by the metal,
which insures a clean surface for q
long time, {.
me talDt stnx aipaple .at,d aesy
test for glue Is given In Fischer
Zeitung: weighed piece of glue
(say one-third Of an 0unce)is sus.
pended in water for twenty-foul
hours, the temperature Of which is
not above SO degrees F. The color.
ing material sinks and the glue
sNells from the absorption ofwater
The glue is then taken out and
weighed; the greater the increase
in weight the better the glue. If Il
then be dried perfectly and weigh.
ed again, the weight of the colorine
matter can be calculated from the
difference between this and the
original weight.
About the most remarkable piece
of engineering work that has come
under our notice lately, was a steam
boiler set in sandstone. The blocks
Of stone were neatly dressed, ant
the work looked very fine outside
but the furnace and pier support
ing the back end of the boiler seem
ed to be in about the same condi
ton that the eggs were in at Ger
tain hotel, where a guest ordered
them poached ami the waite
strongly advised him to have then
scrambled, "for," sad he, "them aig
amt very fresh, boss, and dey lool
betrer scrambledw
A writer in an English technica
journal, having explained how colo
air is the cause of smoke, which
may be greatly reduced by care
remarks that in the open fire grat'
the existing fire ought to be draw
to the front of the CRATE, allowin,
the fresh coal to be placed behid,
or on the back of the fire; thus, tn
fire In the front will burn more rap
idly, warm the air above and $
prepare the rising gasses for com
bustion. In this way the amour
OF smoke is diminished, as the gas
es from the Goals at the back ris
much more slowly than when plac
ed upon the fire and the air partl
warmed. For stoves and boiler.
warm air may be produced for tn
entire combustion of all the gases,
result which is beneficial in variou
ways.
| Another fine specimen Of a Ro
man pavement has been unearthe
at Bridewell Lane, Bath, Englant
in the course Of some excavatin
work. The pattern is composed {
octagons two feet seven inche
each way, the intermediate bein
filled in with squares. In the cer
tire of each octagon is a doubl
uuarterfoil with a circle in the cer
tire, and at each end are pointe
leaves.