On February 23rd 1905, V Neilson at the Urania Observatory using the Thomas Cooke and Sons 10 inch Telescope observed the crater Petavius. He found that in the northern part many rills. In making the observations powers of 328 and 447 were used on the Cooke telescope.
Among the rills was a winding rill that attracted his
attention. It came from the most northerly part of the central mountains and
reaches in a North Westerly direction as far as the wall at the centre of the
crater.
www.theramblingastronomer.co.uk
Would you have details about a 10" Cooke refractor telescope at the Nainital Astronomical Observatory in India? I had the opportunity to use it many years ago. And when I had visited the Dundee Observatory in Scotland they had the same model of the telescope which I saw through once more in a different observatory!
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