When the telescope 55 is pivoted vertically fraction of a degree, {HEAD ~ 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 {TAIL ~ turn} rotates the shaft 30 causing all of the structure mounted on the shaft 30 to swing together to a new position 
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When the telescope 55 is pivoted vertically fraction of a degree , { HEAD ~ 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 { TAIL ~ turn } rotates the shaft 30 causing all of the structure mounted on the shaft 30 to swing together to a new position
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