glass, a fact abundantly demonstrated by Mr. Woodbury in his experiments on
the Photo-Filigrane process, and confirmed by some trials which we have
made.

It must be confessed that roller slide experiments which we have made with
sensitive films supported on gelatine sheets, or on such composite sheets
as the alternate rubber and collodion pellicle of Mr. Warnerke, have been
hardly satisfactory--possibly, however, from our own want of skill; while
no form of the Calotype process which we have tried has proved so
satisfactory as gelatino-bromide paper.--_Photo. News_.

* * * * *




INSTANTANEOUS PHOTO SHUTTER.


M. Audra, in the name of M. Braun, of Angoulême, has presented to the Photo
Society of France a new instantaneous shutter. The shutter is formed by a
revolving metallic disk out of which a segment has been taken. This disk is
placed in the center of the diaphragms, in order to obtain the greatest
rapidity combined with the least possible distance to travel. On the axis
to which this circular disk is fixed is a small wheel, to which is attached
a piece of string, and when the disk is turned round for the exposure the
string is wound round the wheel. If the string be pulled, naturally the
disk will revolve back to its former position so much the more quickly the
more violently the string is pulled. M. Braun has replaced the hand by a
steel spring attached to the drum of the lens (Fig. 2) By shortening or