RECENT PROGRESS OF THE PHOTOGRAPHIC ART. tains a long and most able article on the above sub ject from the pen we think of the venerable Sir Da vid Brewster. The following are some abbreviated descriptions from it suitable for our columns. It is to the employment of two new materials—albumen and collodion—that photography owes the superiority cations. The value of albumen as a photographic material was discovered by M. Niepce de Saint Vic tor in 1848 and it has been employed by photogra phers of all nations but more successfully perhaps in Scotland by Messrs. Ross and Thomson who have produced a series of most splendid photographs 15i inches square of architectural subjects. The follow ing is the process which they have employed. Hav ing taken the whits of several eggs add to them from 12 to 18 drops of the saturated solution of iodide of potassium and beat the whole up into a mass of froth 'and then allow it to stand for ten or twelve hours until it becomes liquid. A portion of the liquid is spread upon the well-cleaned surface of a plate of glass which is then made to revolve at a moderate velocity before a clear fire by meatas of a twisted worsted thread. A very perfect film of albumen is thus spread over the surface of the glass plate and when the film begins to crack at the edges it is withdrawn from before the fire. It is now prepared for the cam era by dipping it into a bath containing a solution of nitrate of silver-70 grains to the ounce of water—to which is added about one-twentieth part of strong bath it is washed once or twice in pure water. It may is quite dry. If the object is luminous the picture green colors in it a longer time is necessary. The picture is then developed on the glass by pouring upon the albumen surface a saturated solution of gallic acid which is spread with a pad of cotton. When the solution has assumed a deep red color a little of the nitrate of silver solution is mixed with the gallic acid and spread over the surface. It now
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