- Spots on the sun
- Standard planes
- Stanfield, Clarkson
- Stars and suns
- Steam-arm, Nasmyth's
- Steamboat, the first
- Steam-carriage for roads
- Steam engine
- Steam hammer
- Steam hammer form of steam-engine
- Steam ram
- Steel
- Steen's rotary engine
- Stephensons, the
- Stirling Castle
- Stockholm
- Stone, W. J., astronomer
- Strikes