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Grupp—A New Collimating- Telescope Gun-Sight for large and small Ordnance. 
Among the advantages of the new sight may be enumerated :— 
Ie 
2. 
3. 
4, 
The all-important advantages of having a fore-sight at a great distance in 
front of the gun, and therefore seen sharply defined simultaneously with 
. the object aimed at. 
As a consequence of No. 1, no parallax, and therefore no necessity for any 
back-sight. 
It is the only sight that can be used with or without magnifying power. 
The image of the + being practically at the same distance as the object 
aimed at, any form of telescope or field glass when in focus for the object 
also gives a distinct image of the +: consequently it is possible to adopt 
any telescope or monocular to the sight itself, or apply it in the hand at 
the back of the sight; or, a binocular can be used looking with one 
element through the sight and the other along the side of the sight. In 
every case a perfectly distinct image of the object with the superposed + 
will be seen. 
The using of a telescope in this way as an auxiliary to the sight is not 
subject to all the disadvantages of the ordinary telescopic sight, as the 
permanence of the adjustment of the telescope itself has nothing to do 
with the accuracy of aiming. If the telescope be loose or out of position, 
it affects the apparent positions of both + and object, but not the relative 
position of one to another, and therefore permanence or rigidity in the 
telescope is not necessary. 
Any form of cross or device can be used. With the ordinary telescopic 
sight the choice is limited to the simple + or some device that can be 
conveniently supported from the side of the tube. For instance it would 
not be possible to have a circle © unless with cross lines thus -o., so 
that it could be supported in the tube. 
In the new sight the device is formed by cutting lines on an opaque film 
deposited upon a piece of glass, so that any form of cross, circle, square, 
&c., can be used, or even scale and figures, can be projected on the 
object, and made useful for the estimation of distance, windage, &e. 
The sight can be hermetically sealed so that no dewing on inside surfaces 
can occur, which often gives annoyance in ordinary telescopic sights. 
. The sight is self-contained, easily detached from the weapon, and has 
absolutely no adjustments, so that it is not posssible to be put out of 
order or adjustment unless actually broken. 
