- Dispart and Tangent Sights.
AG is the axis of the bore, ab the dispart, A'DG' is parallel to AG.
D is the dispart sight, S the tangent sight, A'DS the clearance angle.
At greater elevations than this the muzzle notch is used; to align on the target at lesser angles the dispart sight is so used.
Guns without dispart sights cannot be layed at elevations below the clearance angle.
In the case of most guns it was used in conjunction with the dispart sight above referred to.
This was of wood; the third sight, also of wood, was for guns without a dispart patch, which consequently could not be layed at elevations below the dispart.
I it will be seen that in order to strike T the axis must be directed to G' at a height above T equal to TG, while the line of sight or line joining the notch of the tangent sight and apex of the dispart or foresight must be (/ ?` directed on T.
D is the dispart, M the muzzle sight, ights.
If the dispart sight were EarlyTangent being used, the sighting radius would be OD, but, as Sight.
With smooth-bore arms of short range, the soldier needed little more, in the way of sights, than the rough equivalent of the dispart of cannon, viz.