What was the size of the refractor telescope Schiaparelli had used in earlier observations before the primary instrument of 1877?

Answer

22-centimeter Merz refractor

Prior to using the 38-centimeter instrument for the key observations, Schiaparelli had previously utilized a 22-centimeter Merz refractor telescope.

What was the size of the refractor telescope Schiaparelli had used in earlier observations before the primary instrument of 1877?
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