416 
POPULAR SCIENCE REVIEW. 
photographic purposes until reconverted, and the making of chloride of 
gold is a very simple operation, this gentleman wisely recommends the 
latter process to his brother photographers as the best means of self-defence 
with which he is acquainted. 
Action of Hot Water on Photographs. — A correspondent of the Photo- 
graphic News, complaining of the ill effects produced upon certain of his 
photographs by the use of hot water, as a means of more readily and effi- 
ciently freeing the prints from the decomposing agent, some interesting- 
correspondence is the result, which tends to prove that it is only when a 
photograph is improperly fixed that the heat of the water exercises any 
deteriorating influence upon it. 
Strong v. Weak Printing Baths has been one of the subjects with 
which the photographic societies have been busy during the past three 
months, but the evidence advanced is so conflicting, and the arguments 
made use of so contradictory, that few reliable conclusions seem to have 
arisen therefrom. 
A New View Camera , the novelty of which is that it has a moveable 
front contrived to do away with the necessity for a “ swing-back,” was in- 
troduced to the members of the Photographic Society of Scotland, by Thomas 
Sutton, B.A., editor of Photographic Notes. This method may be, perhaps, 
more convenient than that of a “ swing-back,” but we do not perceive that 
it possesses any other special advantage, and rather suspect that in practice 
it may be found to have certain disadvantages which the older form of 
camera escapes. A similar opinion was expressed, we believe, by Sir David 
Brewster, at the meeting before which it was exhibited. 
New Method of Restoring Faded Photographs. — At the January meeting 
of the North London Photographic Association, Mr. H. J. Godbold 
described a method of restoring faded photographs, which consists in im- 
mersing the faded specimen in a solution of bichloride of mercury (1 grain 
to the ounce of water) and letting it remain therein until the colour has 
grown warmer, and the yellowness has disappeared. 
New Portrait Lens.— Mr. Sutton’s craving for improvement and novelty 
in the photographic appliances is continually originating some fresh sug- 
gestions, some of which die in their very birth-throes, while others are 
mere scientific curiosities, and others again are turned to very useful and 
profitable account. The more recent of this gentleman’s introductions is a 
new view lens, in the form of a very hollow meniscus, with the stop placed 
much nearer than usual to the lens. This is said to give images having 
much less spherical aberration than the common plano-convex view lens. 
Another new portrait lens for moving objects requiring to be taken with 
extraordinary rapidity under unfavourable circumstances of light, or in a 
glass-room,. has also been introduced by Mr. Henry Squires. It being de- 
sirable that our new infant Prince should be photographed, His Royal 
Highness the Prince of Wales was naturally curious about this newly- 
announced extra-rapid lens, and consequently Mr. Squires had the honour 
of submitting the lens and specimens produced thereby to his Royal High- 
ness, and the pleasure of hearing the Prince express his unqualified 
approbation. This is of course a short focus lens, requiring, we are in- 
formed, only twelve to fourteen feet between it and the subject to be 
