Wind Speed by Eye on the Beaufort Scale (1925 Table)

Without an instrument, judge the wind by what it does: smoke, leaves, twigs, branches, whole trees. Match it to a Beaufort number and the notebook gives the speed in miles per hour and metres per second. Result: the wind force 0-12 and its probable speed at 10 m above open ground. Source: Australian Meteorological Observer's Handbook (1925), pp. 45-46, after the Meteorological Office report of 1906. Picture: the table itself.