New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1870-03-07
SCIENTIFIC NOTES.

....,o,.,s,,,, Roam STEAMERs.-It seems that
tho MIN OF covering the driving wheels OF steam oui
ms with thick tire Of indaruooer mas Deen io""" "
,bviate some the most serious ot9ee.ons steam
yuNi,,'' o. icconotion on common roads, anu steam
o,,s With tins Improvement are now hahulac' ,G
E"Sland The London Mechanic M0gdzte t.ns it
nrstion Of this new locomotive: On SATURDAY last
49, &c seen ON the streets of Leh wonderful leah
OF mechanism 1t consisted OF ehorso p1nSr 70 tSe
49, FOR Shipment To those who have been IN the
habit OF seeing heavy machinery arsgg@a a9he Icking
ie or rs horses, and who have Witnessed tie hoA,nH
IpWging swearing and uprOar, which invariably accom-
pauy such undertakings nus h h SYer's face
as ne silently picked his way along the streets streets
slone ihe roads were in the worst possible condlton
hing thick with greasy mud, the journey TO the snip
crane was effected smoothly and easily that II du not
sirrle incident for description. All that can be
ssd nj il il that u was the simplest performance ID the
warld The roadsteamer, which was acting as Tug 10
only inst been completed and had never been out before
II Is 10 horsepower engine, NOMINAL put can ueIeiUp
M 10 80 horsepower Its weight on the road Is ifo
Sc TO niue tuus The diameter Of the wheels IS six ieet
Ihe breadth of the lndidrubher tire is 10 nches WIZ
of "A inches The inventor Of this improvement
il Mr. r W Thompson and the manufacturing HIlu
working under his patent have already receiver hu'
Ous orders for the new road locomotive
PRESERVATION OF SToNE.-Dr. Robert, IN
the Paris Les Mones maintains that the use OF the black
OXIDE of copper and salts, will efectualy prevent
change in stone He shows that the decay OF granle
marble hmestOnes, sandSoDes ana all natura pt h
stones the combined effect OF various causes anu tIa
smong these is very minute liChen, the Leprd dntiq
LS which Is one Of the worst enemies OF stone anu ls
marble sculptures OF the Unknown Pare dc leSants
will uules proper measures be taken Tor staying the
process OF decay unsghtly and ugly masses OF dirt
and unite irretevably lost works OF art WITHIN the
next so wears. The author taking as instances such
bindings at Parts as the Bourbon Palace the Pdidis do
Corps L,gisiatG the Mazarn Palace (FInsiduO, the
Mint, and others points out that dust spider
and the action OF rain combined with the
minute icheu above alluded to- hasten the decay
of stone especially Of those parts where any sculpture
or ornamental carving promotes the deposition OF art
and dust Various places and Instances are cited OF the
application OF oxide of copper aud its salts which places
open TO Inspection, and the length OF time when mas
elapsed such application, seems To warrant the
conclusion that these compounds act as preseTvauves OF
stone In reference TO granite the author states that
this stone is also according TO the experience OF Egyptian
engineers. readily affected by moist climae
than one would DE led to believe The Obelsk OF Luxor
brought from Upper Egypt to PARIS has become Danchea
full small cracks during tho 40 years IT has stoO
on the Place COncOrde although 30 centuries had
not perceptiby affected 1t long as II was m Egypt
Granite In moist climate, becomes the seat OF minute
cTypIOgamc plant, which greatly aids its destrnctlon
and 10 Is moreover, welknOwnfa fact that the dsnte-
grafton Of tins (which cOmpOsed three separate
minerals quartz, mica and fcldspaT, depends very
greatly upon thorough and intimate mixture as wei
ms the chemical composition OF these three ingredients
each Of when in separate state more easily Wltsahos
the influence Of the weather.