The Pseudoscope
The Pythagoras Cup
The Red Sight Lamp
The Reversing Goggles
The Right Angle Prism
The Ring Sundial
The Royal Cubit of Egypt
The Sextant
The Slide Rule
The Small Galileo Telescope
The Solar Projector
The Solar Telescope
The Solar Zeppelin
The Soprano Ocarina
The Star Dome
The Star Twinky
The Stardial
The Starry Sky Postcard
The Steam Engine
The Steam Gyro
The Stirling Engine
The Sun Movement Simulator
The Sundial Postcard
The Tripod Adapter
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Acrylic Lens OM6, f=120 mm, D=16.5 mm
Acrylic Lens OM6a, f=185 mm, D=16.5 mm
Acrylic Lens OM7, f=106 mm, D=34.5 mm
Acrylic Lens OM7a, f=170 mm, D=35 mm
