| 摘要 |
This disclosure deals with a mount for a telescope, and particularly to a mechanism for moving the telescope at the sidereal rate. The mount includes a polar shaft and a sleeve for supporting the polar shaft, the sleeve being fixed in position and the polar shaft being rotatable in the sleeve. A declination shaft support member is secured to the polar shaft, and a declination shaft is rotatably mounted on the support member. To turn the polar shaft relative to the sleeve at the sidereal rate, two arms are provided, one arm being secured to and extending outwardly from the polar shaft and the other arm being secured to and extending outwardly from the sleeve but in a different direction. A motor driven adjusting mechanism connects the outer ends of the two arms and changes the angle between the two arms, and thus rotates the polar shaft, at about the sidereal rate. A manually adjustable device is also connected between the motor driven mechanism and one of the arms and enables an adjustment to be made of the effective length of one of the arms, thereby making the mechanism capable of turning the polar shaft at slightly different rates.
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