New-York tribune., 1872-08-14
SCIENTIFIC NOTES.

Tr,rGRApurSG IN CHINA,-The propiein Vi
,,oerrhnv IN the Chinese language. to wrlte "hon ie
Iras some 5000 different characters, has peeh soiV
An this way thousands Of the characters
are wooden blocks on inc @, pmeS numbered
sSocfs are AT each telegraph station The emma me
chant selects the blocks which eNpeSS @ only the
he transmitted The operator pah,o t6e re-
numerals designating these blocks NnVn me d of tho
eeving operator TO select similar plOoAS AZ N' '''N
line. G. ool,od
Co,oprSc VFNEERs.-Veneers first soakou
far a. hours IN solution Of caustic soda containing
oer cent of soda and boiled therein TOT hai an nou'
and afterward washed with sufnelent W"'ei W ry,
the alkali may be dyed throughout ther mass. A"
treatment with soda effects general dislntegra'o" "
Tho wood whereby II becomes in the moist state eaS'0
md Ieather-like and ready TO absorb any pigment.
After dyeng the wood must be dried between shees vi
paper and subjected 10 pressure to retain & ios i
Veneers treated In this way ana pacSa @ h and sub
iected to another solution, consisting ono Pais Y. ~
snlphate OF lLon S boDrs become beautifully
the expiration OF - hO,u ,,tion of mart of ncrie
and completely dyed black solution OF parto o.IO
,nonia nroduces beautiful yellow, which IS not
changed by subsequent NarilshlnS. NoIllltu 3a
s hot water with the addition OF Onehth OF Its volume
~ sicate of soda and little caustc soda produces rose
oolors of different shades dependent on the ah0nt W
sorb ithout treatment OF Soda is silver gray;
tins color obtained by soaking hen Ior uy iu i % 70
ton consisting Of one part OF protOsuphate OF Hon !"
Ice parts of water.
A NEw ACTINoMETER.-Dr II. Vogel has de-
yiscd new method Of measuring the chemical intensity
oflght which promises to be OF service in photography
He uses ntroprussde solution which, under hght Is
deoomposed. and deposits the preeipitate known as
Prussian blue The decomposition being in proportion
TO the intensity of the light such intensity may be meas
ured by ascertaning the difference In the speche gravity
OF the solution before after its exposure OF by not
ing the of the preciptae formed by means OF
graduated tube To prepare this sensitive liquid cheinl
Caliy pure oxide OF iron, best obtained from te
is dissolved in hydrOchOTc acid ana aiterWaIu eNaP
ated nearly 20 dryness in order 10 eXpe Tue Excess
acid To this then added an aqueous solution OF hilO
prsside OF sodium the proportion OF thIee parts oI
ihe ron 10 two parts Of the sodium solution ms uh9n
must be formed in room hghteu py @ tno
X.ow rays onlv solution is exceedingly sem
sitiye 10 the blue and violet As an instance OF s
sensyeness the actiuiC rays some OF the nqI VIE
exposed light Of Kerosene lamp tor iOltS @
hours without being affected; but no sooner was IL tx
posed To the light emitted from piece OF burning as
nesiun wire than the PTussan blue began 10 preclpIlS
The same objection may, however. be made 10 thls Mhc
was raised against the ingenious device mace py fTpI
Draper of New York many years ago. nanely; Tue PIo
(opraphcr at each measurement must superlheuu
chemical operation, estimate its results ana caeu
the actual actinic force thereirOm what the phOtog
rapher most needs instrument which on exposure
10 hight will move an index finger, thus showing at
ance the amount OF aetnc force developed by dlnuseI
daylight in given time