Sighting device for a ballistic projectile apparatus

Details Sighting device for a ballistic projectile apparatus Sighting device for a ballistic projectile apparatus

1987-07-28

1988-11-22

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Structurally installed including relation to feature thereof

33377, 33235, G01C 9200

Patent

active

047855436

ABSTRACT:
The ring-shaped sighting device comprises an annular ring-shaped space the axial height of which decreasing from a window provided in the annular space for observing the level of the liquid to the opposite side. Hence, the uneven bottom forms a displacer for the liquid present in the annular space, so that the volume of this liquid versus its surface can be maintained of a low value on the entire periphery of the annular space. In this way, thermal dilatation of the liquid has no significant importance on the level of the liquid which guarantees an indication largely independent of the temperature.

REFERENCES:
patent: 4466197 (1984-08-01), Staempfli

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