The platform is surmounted by a simple metal domed lantern which encloses the optical apparatus.

The platform is topped by the simple metal dome which houses the optical apparatus.

The original optical apparatus was a second order lens.

The current optical apparatus is an AGA 250mm rotating lens.

The original optical apparatus was a catoptric system consisting of 21 oil wick lamps with parabolic reflectors.

The megalethoscope is an optical apparatus designed by Carlo Ponti of Venice before 1867.

His name is now known for a piece of optical apparatus.

His optical apparatus was innovative, and he developed a double refracting goniometer, also known as a Leeson prism.

It is topped by the domed lantern housing the optical apparatus, a fourth order catadioptric.

Today, the street is commonly associated with opticians and makers of optical apparatus such as microscopes and telescopes.