Fig. 8

(a) Wind force measurements taken by the Royal Engineers at Halifax, in pounds per square inch, measured in pounds, ounces, and fractions of ounces; (b) wind force measurements by the Royal Engineers in Kingston, in pounds and decimal tenths of pounds, (c) original “wind force” measurements for Winnipeg, where an abrupt transition takes place from a one to ten scale (Smithsonian scale) to values up to the high 30 s.