Photographic Notes, 129 
Mounting a Photograph—The usually difficult operation of 
mounting a large photograph has now been greatly simplified by 
a French artist. For this purpose he provides a large flat box of 
the size of the cardboard, and on the bottom of which the card- 
board is laid ; a kind of frame on hinges, jeunes to the box in the 
form of a lid, is now closed, and tastened down to the box by 
means of hooks ; ; this frame or lid having an opening in the centre 
a quarter of an inch each way larger than the proof or print to 
be pasted. The box is only about one inch high, and on the 
bottom is placed a piece of wood about half an inch thick, 
bevelled off towards the four sides, and of the exact size of the 
print to be pasted. In the centre of the bottom of the box is 
fastened a large screw, so as to raise or fall the piece of bevelled 
wood. Now the Bristol board is piaced in the box, the lid of 
which is closed, the screw is turned, the centre of the Bristol 
board is pressed up the hole in the lid, and the pasted proof is 
taken and placed on the Bristol board, the square hole serving at 
the same time as a guide. ‘The quarter of an inch given to the 
opening on each side allows the proof to be taken by the fingers 
and placed in its proper position with the greatest ease. It 
appears that this simple bulging-out of the middle of the card- 
board before pasting on the proof, gives perfect flatness to the 
whole when dry.— Germantown Telegraph. 
New Blue Print Formula. The preservation of the ammonium 
citrate of iron solution in the formula generally used is often a 
troublesome matter, when larger quantities are made up than can 
be applied and printed immediately. I have recently found a 
remedy for the difficulty by the addition of boracic acid. 
The following is the new formula :— 
a.—Citrate of ironand ammonium ... 2 oz. 
Boracic acid ... set soto Ol 
Water (pure) .. aes A OZ: 
b.—Ferricyanide of ‘potassium ee TOL. 
Water ae ee A OF 
To use, mix in equal quantities ‘and apply as usual. 
A few additional notes may be of interest to amateurs. Paper 
may be safely coated in any ordinary lighted room, and spread 
about ; care being taken that it is perfectly dry before being put 
away. If linen or unsized paper is used, the addition of gum is 
beneficial, but it should not be employed on a sized paper, as the 
sizing sufficiently accomplishes the same object. Where warm 
water can be had, the washing of prints is greatly facilitated. Vhe 
addition of boracic acid gives a lighter print while still wet from 
washing, but becomes a brilliant blue if properly done. It must 
aiso be remembered that it takes a fine negative to give a fine blue 
print.—S. P. Warr, Columbus, O., in the Philadelphia Photographer. 
Wor litle 7—7 
