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Areas           DECIMALS OF A FOOT          No. 2
Scale Vernier Unit Test Plate Ott's K.&E., No. 4230 Coradi's Compensating  
No. Ratio Linear Area Actual Relative Area Reading Setting Constant Setting Constant Setting Constant Setting Constant
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
  Ft. Ft. Ft. Sq. Ft. Sq. Ft. Sq. Ft. Sq. Ft. Units ½ mm Units ½ mm Units ½ mm Units ½ mm Units
  1 1:10 1 = 10 1=100 .0144   .01     10.764 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  2 1:20 1 = 20 1=400 .0144   .04     43.056 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  3 1:30 1 = 30 1=900 .0144   .09     96.876 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  4 1:40 1 = 40 1=1600 .0144   .16   172.224 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  5 1:50 1 = 50 1=2500 .0144   .25   269.10 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  6 1:60 1 = 60 1=3600 .0144   .36   387.50 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  7 1:70 1 = 70 1=4900 .0144   .49   527.43 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  8 1:80 1 = 80 1=6400 .0144   .64   688.89 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
  9 1:90 1 = 90 1=8100 .0144   .81   871.88 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _
10 1:100 1 = 100 1=10000 .0144 1.00 1076.41 1076.4 303.5 17458 52.6 18010 305.9 22881 _ _ _ _ _ _ _ _

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