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Show Average Man Walks Four Miles an Hour Th. ave rage man, walking briskly, I travels at about four miles per hour j Ills body presents to the ulr a surface of about six feet In height to one foot la widih, or about M BflUajre feet I Moving at four miles per hour, he Is traveling at 5-1 feel per second, and' the resistance, opposed io his forward! motion by the "If. assuming It lo he still, is Just about one-hull pound Inj ether words he Is continually pushing ,i one-half pound resistance ahead dl fJH him as ho walks. if the same man walking four miles per hour were facing a gale blowing twenty-five miles per hour, the rolila live velocity of the wind would bj JJH thirty miles per hour, and the man would be walking against a pr-ssiii!b twentv-slx jmunds. Motdt Life. jJH oo ml Joints should be fitted with gasg kets made of wrapping paper. whll water joints should have asbestos gaS 'keU coated with graphite. Hot gas; Jolnta, OII the other hand, should have copper asbestos, and dry gas Jolnft call for coated asbestos. |