A bifurcated arm 57 that is secured to {HEAD ~ one end} of the pivot shaft 56 and extending downwardly will swing from side to side as {TAIL ~ the telescope} 55 is pivoted in a vertical plane about its pivot shaft 56 
A bifurcated arm 57 that is secured to { HEAD ~ one end } of the pivot shaft 56 and extending downwardly will swing from side to side as { TAIL ~ the telescope } 55 is pivoted in a vertical plane about its pivot shaft 56
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH