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This is a torus, a very interesting geometric shape in its own right.
It can also be used to support the sphere while drawing.
Part of the kit is a four-coloured set of markers.
It is easy to draw various shapes and constructions on the surface with the markers.
Another component is a spherical ruler for drawing spherical straight lines on the surface.
For example, we can construct a spherical triangle with the ruler.
The ink of the markers is easy to clean off from the surface with a damp cloth or paper towel.
We constructed a spherical triangle, and then we could measure an angle of the triangle with the spherical protractor.
We can draw circles on the sphere with the spherical compass.
First we put the center locator on the top of the sphere, then fit the tip of the
compass into the small hole in the middle of the locator, and finally draw the circle.
There are compass collars of different inner diameter,
to locate and fix different markers in the compass.
From this poster we can cut out the projections of the northern and southern hemispheres of the globe.
Then we put the projections on the sphere; and cover them with these hemispherical transparencies to make a draw-on globe.
We can freely draw any figure on the hemispherical transparencies.
For example, we can mark out two cities, and connect them with
the shortest distance on the sphere 'as the crow flies'.
If we want to hang up two transparencies with the
drawing on their surfaces, then we fit them together
with this joiner, and hang up this sphere with the
help of a piece of string through the small holes
either on the transparencies or in the joiner.
You can find further information about
the Lénárt Sphere in the attached booklet,
or at www.lenartsphere.com
Have fun!
Thanks for the video to Anna Bujtás and her students, Lilla Lichtblau, Ádám Acosta and Ferenc Beleznay, Eötvös József Secondary School, Budapest.