Related Clues:
- Butterfly valve, e.g.
- Piano part
- More taciturn
- Certain piano pedal
- Less dry
- Piano pedal
- Silencer
- Less apt to speak
- Furnace part
- Furnace control
- Deadening influence
- Draught-regulating device
- Negative influence - more moist
- How to regulate the draught with a little more water
- That will measure the draught - and make it not so dry, perhaps