Mars seen from Liverpool with a Cooke
My Joynson of Liverpool on the opposition of Mars in 1865 using a Thomas Cooke and Sons 6 inch telescope which had a focal length of 7 feet and 6 inches and with eyepiece powers from100 tom 550, he also used a Barlow lens up to 1,100.
Joynson found that no increase of power altered the aspect of Mars, nor did he detect any difference in the markings of Mars since 1862. The snow at the Noth Pole was not visible in 1864. In 1865 the snow at the pole was not so surprisingly marked as usual, and a nearly equatorial belt was very prominent.
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