Conoids; two equal circles in parallel planes, divided equidistantly, are connected by threads, so as to form a cone, a cylinder, a conoid, a second conoid; the director planes, as well as the head lines, of these conoids are at right angles to one another
Descriptive geometry, a new branch of the subject introduced after the French Revolution, was concerned with converting 3D figures into 2D and vice versa – especially important for architecture, shadows and perspective. In 1830 Theodore Olivier designed a series of models which could be distorted and rotated to provide a variety of geometrical configurations. These models were reproduced for decades. This is an example of the more complex type which has threads hanging from the upper frame, held taught by lead weights in the base. The two circles can be manipulated to form a cylinder or a variety of conoids.
- Object Number:
- surface model (string)
- Fabre de Lagrange
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