Evening Republican, Volume 20, Number 204, Rensselaer, Jasper County, 25 August 1916 — Telemeter, “Eye of the Gun” Is a Wonderful Instrument [ARTICLE]

Telemeter, “Eye of the Gun” Is a Wonderful Instrument

The telemeter, used by all artillerists in some shape or other, is also known as the eye of the gun. It is really a tube with two telescopic lenses, one on each end. The “objectives” of the two lenses are placed inside the instrument and towards the end of the tube. Prisms with five faces act as reflectors, so that the person looking in has mechanically spread his eyes to the two ends of the tube, with a tremendous range of vision. Of course, the ends are so arranged that they may be directed at a single object at the same time, thus making it possible for the observer to see what would otherwise be beyond the power of the human eye and to know, by the angle at which It is viewed, the distance away. It requires a little practice to use this wonderful Instrument, but in a few days the operator ascertains how easily he can determine the precise distance he is from the object he is looking at and by a quick calculation he directs the pointing of the gun so that it cannot fall to strike at the desired spot.