Possible Clues:

• Wind-measuring range
• Measure of wind force
• On which zero is 'calm' and twelve is 'hurricane'
• That'll show you how much you've got to wind up
• That''ll show how severe a blow it is
• This will show you just what a severe blow it is
• When it comes to blows, that will show you how serious it is
• Plaque below fine French garrison indicating wind force
• The higher this goes, the more it blows
• Measure of wind speed