40-foot telescope
... that William Herschel's 40-foot telescope was the largest telescope in the world for 50 years?
... that <a href="./William_Herschel" id="mwAso" rel="mw:WikiLink" title="William Herschel">William Herschel</a>'s <b id="mwAss"><a href="./40-foot_telescope" id="mwAsw" rel="mw:WikiLink" title="40-foot telescope">40-foot telescope</a></b> <i id="mwAs0">(pictured)</i> was the largest <a href="./Telescope" id="mwAs4" rel="mw:WikiLink" title="Telescope">telescope</a> in the world for 50 years?