| 摘要 |
PROBLEM TO BE SOLVED: To realize illumination for appreciating that a floating body moves in a transparent body. SOLUTION: A tubular circulated space 2 is provided in a transparent body, a liquid 3 is filled therein and further a floating body 4 is put therein. A light source which makes a heat source 5 is provided close to the tubular space 2. A transparent liquid having the same refractive index as that of the external transparent body is adopted as the liquid 3. The liquid 3 is heated by the heat of the light source and circulated inside the tubular space 2 by convection. Therefore, the floating body 4 is moved. The tubular space 2 is not seen from the exterior but only the movement of the floating body 4 is seen. |
