| 摘要 |
This invention introduces a variable-speed text projector that consists of two concentric cylinders and uses the convection of heat from a central light bulb to rotate the inner cylinder. A circular cover that fits onto the larger outer cylinder (projection screen). This circular cover controls the speed of the rotation of the inner cylinder. By venting the heat emitted by the bulb (controlling heat flow) in small to large increments, the cover adjusts the speed of the moving text. This constructed top is necessary to this device. The preferred embodiment provides an ease of facility and control of speed to the user who desires to read the text in comfort.
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