`  refracting telescope (from ``Smith's Illustrated Astronomy`` 1848).]] *The 1845 Merz und Mahler 11 inch refractor – Housed in the ``Mitchel Building``. May be the oldest continually used telescope in the world. It is currently used for public education programs. *The 1904 Alvan Clark & Sons 16 inch refractor – Housed in the ``Herget Building``. Used in public education programs and graduate research.    wiki editors are a joke !!     `