New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1850-07-31
SCIE N G e.
Interesting Scientific Intelligence. ..No. XIII
rc,..,,, for ne Tribune from AHibsrtc ,oures

these are to be observed in an English patent en-
rolled in June the present year The patentees
are Messs William Henry Fox Talbot and Tho
mas Augustine Malone the former Of the County
Of Willis the latter Of Regent St London. Inc
improvements patented by these gentlemen are:
Frst The use of plates Of ungiazed porcelain,
10 receive the Photographic image.
Second 4 method Of converting or changing neg
alive Photographic images into positive ones
Third, The employment OF the vapors Of ioiine
and bromine in photography, as preliminary 10
the formation Of Photographic images upon hlms OF
abumep gelstine or other substances OF animal or
vegetable origin-the employment OF these vaPors
having been hitherto confined TO their action on
polished metallic surfaces.
Fourth A method Of obtaining more complete
fxation Of Photographic pictures on paper.
Fifth, The use Of vanished paper, or otner
TRANSPARENT paper impervous 10 water, az sub
stitute for glass in certain circumstances, to sup
port film Of sbumen for Photographic purposes
S,rth, Forming Photographic pictures or images
on the surface Of polished steel plates. Win re,
spect to this part OF the invention, tne patented
claim the production OF Photographic image upon
q plate Of steel
Tbis subject has also attracted much attention in
the Paris Academy Of Sciences. NJ. BALLARD re.
Gently presented to the Academy a communication
from NJ. PoITEyIS, on the means OF obtaining well
defined and very transparent negative proofs, capa-
bic Of being taken OFF great number Of times on
ordinary Photographic paper. tits by the employ
ment Of gelatine that NJ Poitevin has obtained the
proofs, the specimens OF which were submitted 10
the inspection Of the members OF the Academy, oy
| NJ Ballard To prepare the layer Of gelstiHe on
which these negative impressions are mace ID;
| Poitevin dissolves six parts OF gelatlne, OF COCO
ouaDtv in 90 parts Of water This SeIatIne shouid
be entirely free from all salts "hlcn are so'uVe ~
m
,netters To form the solution the gelaune Is
stepped in distilled water during ten or fifteen min.
utes gently heating by means OF asplrlt-iamP ana
occasionally stirred until the gelatne 10 completely
dissolved II is then passed through filter OF linen
previously moistened and it's surface skinned
This solution of gelatine is taken up by means Of
pipette, and run on well polished piece OF glass.
The sensitiveness Of these glass plates is abou.
four times less than that of the silvered metal plates
prepared with iodine and bromine For well.
lighted landscape and with an object glass OF small
diaphragm the exposure Of the plate in the cham
Der of the camera would require from 90 10 100
seconds. Portraits may be taken in about two
minutes NJ Poitevin, in trying the effect OF the
vapor Of bromne on these plates, has found that
they arc thereby rendered more susceptible OF I'M
preston but he has not made a Sufficient number
Of experiments to warrant bis drawing any definite
conclusions on the subject.
Another communication to the Academy, by III.
BLANQUART EvRARD, presents some additional
facts The great desideratum TO be obtained in
Photography says NJ. Evrard, is method of rem
deripg the exercise Of the art on paper, at once
simple, certain and easy. To accomplish this he
describes:
First. A method OF taking Photographic sketches
on dry paper in place Of the damped paper, as the
processes at present in use-thus removing the
difficulties arising from the necessity Of preparing
the Photographic paper at the place where It re-
Quired to be used.
Secondly: A simple method Of preparing this
photogenic paper, so that it may be prepared and
sold ready for the use Of the amateur, who need
not hence forth take the trouble of preparing II
himself The papers, the preparation OF which has
been given in previous communications cannot be
dried without taking, when acted upon by the
J gallo acid.-a uniform color obscuring the pho
/ togenic image, and causing it completely TO dis
appear.
this inconvenience the following Is the mode OF
proceeding in the use of this new material Collect
In filtered state the clear part OF milk, which has
been allowed to turn; beat this serum up with
white Of egg, 10 the proportion Of the white of two
eggs TO pint and three quarters of serum. Boil,
in order to separate all solid matters, filter again,
and when cold dissolve in the liquor five per cent
of iodde of potassium The paper TO be prepared
should be seltc cited with much care; it should be
very thick, aud ent rely plunged into the liquor for
two minutes, then dried, by suspending it in the
air attached by pins 10 line stretched across the
room. This preparation may be made in full day
light, without any particular precautions beng
taken; and the paper thus prepared is ready for
use either Immediately, at the end Of six months,
or even longer space of time.
In another paper NJ Evrard details his method
Of obtaining the instantaneous formation Of the
image in the camera obscurs-viz:
"Fluoride of potassium, added to iodide OF potas.
] in fha erat al no nrO.
duces instantaneous images on exposure in the
camera. To assure my self of the extreme sensbli-
I ty of the fuoride have made some experiments
on the slowest preparation employed in photogrs-
phy-that OF plates of glass covered with albumen
and iodide, requiring exposure at least sixty
times longer than the same preparation on paper.
On adding the fuoride to abumen and iodide, and
substituting for the washing of the glass in distilled
water after treatment with the acetO nitrate OF sill
yer, q washing in fuoride Of potassium, have OBJ
tanned the image Immediately on exposure in the
camera. | have even obtained this result but un
der conditions less powerful in their action without
the addition Of HuOride to the abumen and by the
immersion only OF the glass plate IN bath of huo-
ride after its passage through the aceto nitrate OF
silver. This property of fuoride is calculated to
give very valuable results, and will probably cause,
in this branch OF photogr aphc art, change equally
as radical as that eiectedby the Of bromine on
the iodized silver plates of NJ. Dsguere.
PHOTOGRAPHIC IMAGES OF TIE Sun AND MOON.
NJ Niepce de st. Victor lately presented to the
French Academy images of the sun and moon
taken by his Photographic processes on a layer Of
albumen. These impressions confirm the opinion
already promulgated by NM Fizreau and Fou
cault that the center OF the sun emts RAYS of a
higher photogenic power that those emitted from
the edges Of that lumiDary.
IMPROVEMENTS IN MACHINERY APPLICABLE TO AcRI
Cultural AND sANAToRY PURPOSES.
Mr.. Joseph Whitwonb, an engineer, Of Manches
ter, Eng has recently patented number Of i'm
provements in machinery applicable to agriculture
and ssnatory purposes which are thus described ;
With regard to the subject of the invention o
improvements in machinery applicable to sgricul
raj and sanstorv nurnoxef the natentea claims.