VARNISHING THE FINISHED NEGATIVE.
Benzoin varnish is the best coating that can be given to a Collodion negative. It resists the action of pieces of grit; it does not crack; and, above all, it does not, like amber varnish, split off the picture on the slightest friction.
The application of this varnish is a very simple matter. The negative is to be again placed on a pneumatic plate holder, and the varnish is to be poured on to the surface in precisely the same manner as the Collodion was at the commencement of the process, the superfluous quantity being returned to the bottle: in a few moments the varnish will be quite dry and hard, and the plate may be handled with perfect safety.
I may mention, as a precaution, in varnishing the plate, that it is better to perform that operation in a still atmosphere; as the solvent of the gum being chloroform and very volatile, if it were conducted in a current of air, there might be some difficulty in obtaining an even coating to the picture.
In concluding this description of a process, which is at once simple and certain, I would ask the patient attention of those who may do me the honor of repeating my experiments. I have endeavoured to render the details of the process as intelligible as possible, and if I have succeeded in advancing the art of Photography only one step by so doing, I consider that it is an ample return for hours and days spent in anxious thought and laborious experiment.
FINIS.
SPECIAL LIST OF REQUISITES
FOR THE
DRY COLLODION PROCESS,
SUPPLIED BY
Messrs, BLAND & LONG,
Opticians, & Photographic Instrument Makers
TO THE QUEEN,
153, FLEET STREET, LONDON.
BLAND & LONG'S
IODIZED DRY COLLODION.
This preparation will keep for an indefinite period, and can be exported to any climate, without risk of deterioration.
Half-pints, 10s.; Pints, 18s.
BLAND & LONG'S
PRESERVATIVE SOLUTION,>
READY FOR USE.—1s. per pint.
BLAND & LONG'S
BENZOIN VARNISH,
FOR PROTECTING THE FINISHED NEGATIVE.
1s. per oz.
This varnish does not require the plate to be warmed; but dries instantly, leaving a perfectly hard transparent coating on the picture.
NITRATE OF SILVER BATH,
FOR BLAND & LONG'S DRY COLLODION,
Ready for immediate use.—7s. 6d. per pint.
PURE CHEMICALS.
| s. | d. | ||
| Fused Nitrate of Silver, absolutely pure | 4 | 6 | per oz. |
| Glacial Acetic Acid | 1 | 0 | " |
| Pure Gelatine | 0 | 6 | " |
| Pure Citric Acid | 0 | 6 | " |
| Gallic Acid, pure | 1 | 6 | " |
| Iodide of Cadmium | 3 | 0 | " |
| Hyposulphite of Soda | 1 | 0 | per lb. |
| Pure Sulphuric Æther | 0 | 6 | per oz. |
| Absolute Alcohol | 0 | 6 | " |
FOR THE PRICES OF APPARATUS
SEE
BLAND & LONG'S
Illustrated Catalogue of Photographic Apparatus
Sent free by post, on application.
SENSITIVE
DRY COLLODION PLATES,
READY FOR EXPOSURE IN THE CAMERA.
(LONG'S PROCESS.)
Messrs. Bland & Long are now prepared to supply these plates, carefully secured in sealed cases, with full directions for exposure and development, of all sizes and in any quantity, at the following prices:—
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LARGER OR OTHER SIZES TO ORDER.
The advantages of a certain and simple Dry Collodion Process are so obvious to those who have practised Photography in the open air, that we feel it is merely necessary to introduce the above list to their notice with as few remarks as possible.
We would, however, mention a few particulars connected with the process for the information of those who have not hitherto practised the Dry Collodion process, as detailed by Mr. Long.
The plates as prepared for sale, are hermetically sealed in an envelope perfectly impervious to air and moisture, they can therefore be exported to any climate without risk of deterioration.
Plates prepared by Mr. Long's process will keep sensitive for almost an indefinite period, and can be developed at any time without regard to the date of exposure; this, it will be seen, is of immense advantage to the tourist, as he can delay the development of the whole of his plates until his return.
To those Photographers whose inclinations or want of leisure will not admit of their carrying through the first preparation of the plate, these Dry Sensitive Plates will be found invaluable, enabling their whole energy to be directed to the more careful selection of subject.
The plates being dry, there is no danger of dust settling on their surfaces; this point will be appreciated by every Photographer.
The development of the pictures can be conducted in any room whence the light can be excluded—as the process is simple and clean—three dishes being the only requisites in point of apparatus.
To Officers, Engineers, and Architects, these Dry Plates offer a desideratum of no small value, as they are always ready for use, occupy very little room in travelling, and can be used under circumstances which would preclude the adoption of any process that had to be carried out on the spot.
BLAND & LONG,
Photographic Instrument Makers to the Queen
153, FLEET STREET, LONDON.
THE
DRY COLLODION PROCESSES.
Messrs. BLAND & LONG have invented the following
simple means of
CHANGING THE DRY COLLODION PLATES
while working in the fields. The plan has been in use
for some time, and answers perfectly.
Price according to size.
Adapted to Stereoscopic Camera, 15s.
DESCRIPTION AND DIRECTIONS FOR USE.
No matter what process we employ to retain the sensitiveness of our plates, it is most objectionable that the glasses should be made to slide by their gravity from the plate-box to the slide; for if we employ either honey, glycerine, or oxymel as preservative agents, the chances are considerably in favor of an amount of dust settling on the surface, the dust being in a great part formed by the attrition of the roughened edges of the plate against the plate-box. Another inconvenience attending the use of a box when the plate has to slide, is the danger that exists under that arrangement of ripping the film from the edges of the plate by the friction against the groove in the box which holds it. These may appear very trivial matters, but they are nevertheless great drawbacks to successful operations.
We may mention that the plan we are about to describe is equally applicable to all Cameras of moderate size. We will, however, take our description from the form of apparatus adapted to a double lens Stereoscopic Camera.
The Camera (A) is furnished at its back with two wires (B). On these wires slides the plate-box (C), which has previously been fitted at its sides with two sockets (D). Just inside the back of the Camera box is a spring (E), and on the top of the Camera is a button (F), which secures the dark slide in its place.
We now slide the box of prepared plates (C) on to the wires (B), the lid of the box opening from the Camera; we then stretch over the whole affair, the black light proof covering (G); this completes the arrangement, and now for the mode of operating.
The opaque covering is furnished at its side with two elastic rings. Into these thrust the hands, so that the rings may firmly encompass the wrist. Then open the plate-box, and throw the lid quite back. Next unbutton the door of the dark slide, and raise it until the spring (E) flies underneath it, and retains it in a horizontal position. This we will presume to be done with the right hand; the left hand being engaged as soon as the door is opened, in holding the plate that is already in the back in its place. The right hand being now at liberty, comes to the assistance of the left, and the plate that has undergone exposure is safely transferred to the vacant groove in the plate-box. This accomplished, the next plate is to be placed in the back, and the same operations gone through in the inverse order, the left holding the plate in its place, while the right releases the door from the influence of the spring (E), and re-buttons it, leaving the plate quite safe in the dark slide.
When we require to focus for a fresh picture, it is only necessary to remove the dark covering from that part of the Camera where the ground glass is placed. The picture can be seen without removing the plate-box or the whole of the covering.
It is obvious that there is no limit to the number of glasses that can be taken to the field of operations. In this way, several boxes holding a dozen each, can be strapped together and placed on the Camera, one by one, as occasion or opportunity may direct.
H. Silverlock, Printer, Doctors' Commons.
PRACTICAL PHOTOGRAPHY,
ON GLASS AND PAPER,
A Manual,
CONTAINING SIMPLE DIRECTIONS FOR THE PRODUCTION OF
PORTRAITS, VIEWS, &c. BY THE AGENCY OF LIGHT,
INCLUDING THE
Collodion, Albumen, Calotype, Waxed Paper, and Positive Paper Processes.
By CHARLES A LONG.
Fourth Edition, price 1s.; per Post, 1s. 2d.
ILLUSTRATED PHOTOGRAPHIC CATALOGUE,
FREE BY POST.
SPECTACLES:
WHEN TO WEAR AND HOW TO USE THEM.
ADDRESSED TO
THOSE WHO VALUE THEIR SIGHT.
By CHARLES A. LONG,
THIRD EDITION. POST FREE, SIXPENCE.
ALSO,
A DESCRIPTIVE AND GENERAL CATALOGUE
OF
SCIENTIFIC & EDUCATIONAL INSTRUMENTS
AND
CHEMICAL PREPARATIONS,
Manufactured and Sold by BLAND & LONG,
OPTICIANS, PHILOSOPHICAL, PHOTOGRAPHICAL, AND CHEMICAL INSTRUMENT MAKERS,
AND OPERATIVE CHEMISTS.
Free by Post.
PUBLISHED BY BLAND & LONG, Opticians,
Philosophical and Photographical Instrument Makers to the Queen,
163, FLEET STREET.
Transcriber Note
Minor typos corrected. Images moved to prevent splitting paragraphs.