19 Topics

• Calculating machines
• Camera obscura
• Clocks and watches
• Double horizontal dial
• Globes
• Hydrometer
• Lenses
• Microscopes
• Napier's bones
• Pantograph ("Parallelogram")
• Protractor
• Scotoscopes
• Slide rule
• Spectacles
• Spy-glasses
• Terrella
• Thermometer
• Tube spectacles
• Wren's perspective drawing instrument