New-York tribune., 1871-03-28
SCIENTIFIC NOTES.

ZINC CoATING.-COpper and brass may DC
oted with zinc by mmersng the article to he eoatou "
bciing bath OF salammoniac containing either scc md
nowdcrcd zinc. The zinc thus ueposlttur r "i"
hrm. ,,.,,,>,v
SUBSTITUTE FOR ALBUMEN IN ANILlNE
nvrrxa-A compound Of glue and tungstic aciu -
,broyyn down when tungstate OF soda hydrochorio "
and thick solution OF glue are mixed When that il
about f. this compound Is SO solI siI Ihcome solid
may he drawn ont into thin sheets. when pecou
and brittle cooling This substance uds anime col
fully employed instead of albumen IN nNlns ""''''
Irru.rcp Avn GryCFRINE.-M. Rost has
ate a material suited 10 a variety Of purposes "9 MA
ting protoNide OF lead Qitharecl and s9co'tno 80
tbcv form creamy LIQUID. In short the ,ih Sic raiv
bceones hard and Homogeneous mass wiivn - on2
1bors IN metal and ressts the action OF Mad 49, oi,u ~
steam and is not reduced by zen J stete NAV no
II n valuable cement ana, III '4' W ' '
used in gavano-rastc coP9iDh'
Co,,pprssFD LEATHER SCRAPS.-An article IN
7ilrs mic Journal gives aprocess Tor utilizing
1,br sbavings and scraps. They are FIRST cleansed'
tbcn soaked in water containing per cent or suphue
aStear6 compressed into blocks and dried by steam
order 70 soften the % poek Se tSeT are cD PASSED
broneh rollers and brought TO the proper thickness to
I've rsed as inner sOles of boots and shoes.
KAoIIN.--Dr c. Bischof describes in Din
ler Porteehnie Journal series Of experiments made
with porcelan clay from ten different localities his oh
ct being to determine the value of these various kinds
Of kaoln 10y means Of pyrometrical method The
standard sample the levigated kaon from ZettiZ,
Robemil This consists in 100 parts, of alumina 3st4
Chemically combined silica, 1888 silica, as sand, 5l5;
nacncsa, O3S lime, 00s peroxide OF IRON, O9G potassa
O66 0o> by Ignition laOD Inns Sample IN Po"uSr, was
compressed into the shape Of small cylinders and Then
heated 10 the temperature OF the melting point oI pau
this ignition, fuN Of from one 10 twotenths OF the
weight OF the kaolu added, and the cylinders were
again subjected to the same hgh temperature IN lne
same manner the several samples trom other Iocalles
were tested.
DIsrINcrNEss OF DISTANT SoUNDs.-Mr. C..
a.. o,,1
last three months of 1870, made series OF observations
ON sound which gave unexpected results The sources
Of sound were the guns Of Fortress Monroe distant
about miles from Prospect Hill, the point OF obserXa
tiOn) and Sucs Whistle at Cherry stone G3 miles dis
tan) and at Hungars Wharf miles distanO, all in
southwestery direction from the point OF observation
During the months when the intervening woods were IN
full foliage the sounds almost or entirely lost
and the force and direction Of the wind, shows that
sounds of maximum Intensity were heard when the
wind was blowing from the north as wei M a. irTu ' n
sound against the wind is uncXpainedi but II j. prom
he that had harometIical and hygrometrcal observa
been also made, clue would have been lOuhd
% the cause OF this curious result
DRYING RFTARDs DECOMPOsITION.-PrO A.
W Williamson Of London, has recently delivered series
OF lectures on Fermentation, from Of which the fol-
lowing II condensed. Al processes of fermentation are
accompanied by moisture. The little organisms which
cause fermentation are soft and wet moisture consti-
tutes great part OF their substance, and IN dry me
dum they cannot live. Applications. therefore OF q
mere drying process among the most important ana
interesting OF this class OF agencies terms o putldc
tiOn or decomposition may he present In fruit but II You
merely take away the greater part OF the moisture you
render the substance lucapdhc or QecOHpOshg Among
the agents which for that purpose there are some
which abstract the water not in state Of vapor but III
the liquid state. II you put piece OF fresh meat IN con
tact with salt rub IL over with salt the salt gradually
absorbs the water. The action is truly drying action
upon the meat and il is ehectua In like manner II Is
known to many persons that sugar is used Just as st
II is said that ordinary jam-ruit and sugar when hvt
been boiled together for tme-keeps better II the
pots into which il is poured tied mp while not II the
paper can act AS straner, IN the sale way a col-
wool. II must be people suppose II one pot OF Jan
De allowed cool before IL is tied down, little germs
vitality because they fail upon cool substance; tbey
will be shut in by tue paper and Will soon fal TO w0rh
ne filed with a boiling hot mixture, and Immediately y
covered oyer though, Of course, some OF the outside I
De scalded and in all probability destrOyed so that nc
decOmpOsitiOn can take place.