Hi The first link did not work but from what I recall about the search for a planet beyond Neptune a 13 inch astrographic refractor was used on a standard equatorial mount. I have a document somewhere about this search and it was possible to mechanically change the drive rate of the telescope in RA and Dec to match a body moving at a particular angular velocity. In the second article they mention a schmidt telescope - this doesnt ring a bell. Of course my memory re this might be a little out :-(( Tday this can be done much easier under computer control and using such things as stepper motors so I dont think it would be really worth while trying to copy the situation at Lowell Observatory. Cheers Greg ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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