Tellurium N med lys

The particular innovations are the use of a Fresnel lens to produce an extra bright and parallel light beam which illuminates the earth globe completely.
Further the focussing of a light point on the globe to demonstrate the apparent movement of the sun between the tropics and the use of a horizon disc with shadow-pin figure to show the position of the sun by the shadow fall.
The Tellurium N was designed by Prof. Dr. J. Newig, Kiel in cooperation with Cornelsen Experimenta.
 
The Fresnel lens:
A short focal length provides a directed, parallel light with the result that a full half of the globe is illuminated and the shadow line (day and night) corresponds with the nature.
Formerly designed Telluriums are not able to show it like this.
The three positions of the Fresnel lens:

• Day and night, seasons: The globe is fully illuminated and the shadow line is clearly visible.
• Tropics (sun-point): The lens focuses a small light point with a ‘hale’ on the centre of the globe. When the earth is turned around the sun the light point moves across the equator between the northern and southern tropic.
• Lunar phases: The moon will especially be illuminated. When the moon is turned around the earth by hand the lunar phases and the eclipses can clearly be demonstrated.