A farkon 1800s Joseph von Fraunhofer amfani da basirarsa a matsayin gilashin maker don ƙirƙirar sosai tsarki prisms, wanda ya ba shi damar lura 574 duhu Lines a cikin wani alama ci gaba da bakan. Ba da da ewa ba bayan wannan, ya hada da na'urar daukar hotan takardu da prism don lura da bakan na Venus, da Moon, Mars, da kuma daban-daban taurari kamar Betelgeuse. Kamfaninsa ya ci gaba da kerawa da kuma sayar da high quality refracting telescopes bisa ga ainihin kayayyaki har sai da rufewa a 1884.
Yusufu von Fraunhofer