Separate stadia are provided with the reticle, allowing {TAIL ~ the marksman} to gauge the angle subtended by {HEAD ~ an object} of known size to determine the apparent distance to the target 
Separate stadia are provided with the reticle , allowing { TAIL ~ the marksman } to gauge the angle subtended by { HEAD ~ an object } of known size to determine the apparent distance to the target
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH