Traditional leveling involved using a level to read numbers marked on a rod, such as the one shown here.
Revised
March 28, 2007
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/transformations/ht_mod/image2.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/transformations/ht_mod/image2.html