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The Cassegrain acquisition and guiding (A&G) box

At the rear of the INT primary mirror cell is the Cassegrain turntable which can be rotated by 365 degrees, and onto which the A&G unit is mounted. The Cassegrain A&G Unit of the INT has been designed primarily for use with the IDS and FOS-1. Nevertheless, the overall philosophy of the design has been to incorporate a range of facilities which would be required by most instruments operating at the Cassegrain focus. The full field is 20 arcmin in diameter, but the comparison lamps and filters are only useful over a more restricted field of 4 arcmin, matching that of the IDS.

Fig. 3.2

The following functions are provided:



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Wed Apr 6 22:56:39 BST 1994