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 {TAIL ~ the shaft} 30 causing all of the structure mounted on the shaft 30 to swing together to {HEAD ~ 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 { TAIL ~ the shaft } 30 causing all of the structure mounted on the shaft 30 to swing together to { HEAD ~ a new position }
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