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Titles
- [Camera obscura?]2
- [A telescope and components]1
- [An optical instrument]1
- [Binoculars and a telescope]1
- [Light projection apparatus]1
- [Lines of perception]1
- [Optical illusion]1
- [Phase of the moon]1
- [Projection of light through a telescopic lense]1
- [Properties of light when passed through an opening]1
- [Refraction of light as it passes through a lense]1
- [Reversal of an image as it passes through a lense]1
- [Telescope and components]1
- [Telescope with diagrams illustrating how it works]1
- [Telescope with four diagrams illustrating the passage of light through the scope]1
- [The reversal of an image when projected through an opening]1