New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1874-06-27
APPLIED SCIENCE.

APPLIED SOIENCE.
R,.cK INK FOR MARKING BOXES, &C-A cheap
marking ink may oe prepared by nssoNihs
"a nar Of extract Of lowood in 800 parts OF water
and adding parts OF yellow Shromate OF po'''"'
should be stirred with brush on using
YELLOW ON SILK GARMENTs.-Boil the ar'', ,'.
for half an hour in Marsees soap WIN 'ne arc'.
ton of wheat bran; then rinse, and aye 70 gun ="
bath of soap and annato. lift ana pas cb thev will
sulphuric acid bath of beaun,c' III ""''"
acquire beautiful yellow coioi'
Cuocor ATE Co1oE on WOODEN GARMENrs.-Boii
Ion nopnds of the goods for an hour with ohe-hl oi
n Mound of alum one-half of pound OF tartar ana
6ye ounces of chromate Of potash allow the them 10
nol IN The bath and dive by boiling for one-naI an
hour 10 fresh bath of iustle Brazil WOOL anu log
wood according TO the shade desired.
SCARLET ON HA1F-WooL GARMENTs.-Boil ten
pounds of thoroughly cleansed goods for hall an
hour with one-half of pound OF oXahc acld' one
nnarter of pound of tin salt, one pound Oh tur-
merc, and one pound of cochineal then rinse p &c
six hours in a bath Of one-quarter Oh a lsou,u Va
tannin reel Off and finish dyelDg In cold Iuchsho
bath.
PuOrO- NGRAvING.-Materal progress is made IN
the application of photography to various branches
nf engraving The arts of photo-thography ana
photo-plate printing have lately been supplemented
by certain processes, which are called by those VINO
employ them, "photo-engraying." These opera
tions though their details jealousy kept secret
NAV be safely said to depend largely upon producing
by means Of bi-chromatized gelatin, from an or
binary glass negative Of the drawing or engravinga
relief plate in metal either an eectrotype OF stereo
type. as may be desired. This may then DE enl-
ployed as usual in the printing press. OTlginai pen
drawings and copies from wood cuts steel OF ntno
graphic engravings are reproduced WITH exqnlsite
fidelity and ii is said very cheaply. Tie AFFINITY 10
emnoy a relef-plate in the printing press of course
greatly lessons the expense OF subsequent printing,
as compared with other methods. Photo-engravmg
of the character here referred 10 is al present carried
sn 10 New-York and Philadelphia.
ARTIFICIAL H,TcnING OF SILKwORNs' EGGs.-A
very curious discovery has been communicated by
Susani an Italian scientist to the French Society Oh
Agricuturists, TO the effect that the hatching OF
silkworms eggs may be artiticially fastened by
friction The process consists essentially in brush
ing the eggs vigorously for ten or twelve minutes
with moderately hard brush, made. preferably, OF
coarse grass In less than fifteen days the thus
treated will hatch out with product as healthy as
that obtained in the usual way. small proportion
of the eggs NAV prove refractory TO this novel treat
ment and vet in the Spring even these Will hatch
out earlier than those which have been left to them
selves.
Susani performed series of experiments upon
abont four-ffths of an ounce of silkworms' eggs,
beginning on the 1st of August. They were brushed
for ten or twelve minutes daily and only about one
tenth of the whole number were lost. Inc hrst
hatchmgs occurred on the 14th OF the month, ana
were succeeded by others for seventy-two consecu-
five DAYS. the largest number Matched on the
pinth day following Aug. IA giving liz worms.
After this date the hatchings decreased. FROM
Aug. Il to sept. 9S2 worms were hatchedr 4, OUT.
which came ont during the first fifteen days were
raised and ,prOspered perfectly, although 1t was
found Una. 'g hastSest No satisfactory by
pothesis has vet been proposed 10 account Tor the
curious effect thus produced by friction upon these
eggs; but new experiments are III course OF eXecu-
ton and NAV lead to something more DEFINITE.
Probably the discovery will be found to have i'm
p0rtant practical bearings; but much remains TO he
done III order to render 1t available
PHoTO-STERroTYPING-It is stated by Fink that
metal plates which can be employed in connection
with ordinary type can be prepared from photo
graphic negatives, according to the following SIM
pie process A solution of one ounce of bchrOmate
IF potash in 10 ounces of water is slowly warmed,
and ounces of fine gelatine gradually added. When
the latter is completely dissolved and the liquid has
about reached its boiling point it is filtered through
fine linen piece of plate glass several inches
larger each way than the proposed picture is coated
center while the plate is in horizontal position, dis
tributing the solution to the margin by means OF q
fine brush and repeating the pouring until him
about one-eighth of an inch thick is formed. 1t is
then allowed to dry, which will require to days.
and is afterward exposed under transparent colo
dion positive taken from q negative OF the object
TO diffused light for 10 to 30 minutes and then
treated in the dark with lukewarm water III tray,
until the relief is fully developed. which VIII be III
from ; TO 10 minutes. After drying 1T with inter
paper it is brushed with glycerine with line large,
soft brush, the excess being removed with inter
paper plaster matriX is formed from this relief,
by pouring on to it, while held in the hand; fine
plaster mixed with water to the consistency OF oil,
and tapping it gently ON the under side to remove
airbu6bles then placing perfectly level and ponr-
ing on il thicker moisture of plaster and water nm
hi the ayer about 4-10ths to 510ths of inch thick.
After Is TO Is hours it can be removed from the re-
knife and gently pressing and is then tit for the
type-founder after being retouched II desired, at
any points with needle.
M SDTIETIEN