When the telescope 55 is pivoted vertically fraction of a degree, the arm 57 engages either of the switches 58 and 59 which energizes the motor 43 to rotate the shaft 42, gears 41 and 40 which in turn rotates the shaft 30 causing all of {HEAD ~ the structure} mounted on the shaft 30 to swing together to {TAIL ~ a new position} 
When the telescope 55 is pivoted vertically fraction of a degree , the arm 57 engages either of the switches 58 and 59 which energizes the motor 43 to rotate the shaft 42 , gears 41 and 40 which in turn rotates the shaft 30 causing all of { HEAD ~ the structure } mounted on the shaft 30 to swing together to { TAIL ~ a new position }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL