Weber Leil Otoscope
Weber - Liel a student of August Lucae became the Professor of Otology in Jena. During this period he published a large number of his works. One such work is the design of an otoscope which he used on a regular basis. He coined the term "era microscope". It had a complicated system of concave mirror to focus sunlight at one end and a speculum with an eyepiece which gave a magnified image of the ear drum of the other. The concave mirror focussed sunlight into the lens in front of the aural spculum.