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Areas           DECIMALS OF AN INCH          No. 1
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
  Ins. Ins. Ft. Sq. Ins. Sq. Ft. Sq. Ins. Sq. Ft. Sq. Ft. Units ½ mm Units ½ mm Units ½ mm Units ½ mm Units
  1 1:12 1 = 1 1=1 .01       .01         15.5 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  2 1:24 1 = 2 1=4 .0125       .05         62.0 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
  3 1:36 1 = 3 1=9 .01       .01 Y'd         15.5 Yds 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  4 1:48 1 = 4 1=16 .0125       .2       248.0 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
  5 1:60 1 = 5 1=25 .01       .25       387.5 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  6 1:72 1 = 6 1=36 .0111       .4       558.0 1395 239.0 18475 121.8 18760 236.1 24648 _ _ _ _ _ _ _ _
  7 1:96 1 = 8 1=64 .0125       .8       992.0 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
  8 1:120 1 = 10 1=100 .01     1.0     1550.0 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  9 1:144 1 = 12 1=144 .0111     1.6     2232.0 1395 239.0 18471 121.8 18760 236.1 24648 _ _ _ _ _ _ _ _
10 1:196 1 = 16 1=256 .01562     4.0     3968.0   992 327.3 17343   26.8 18794 332.0 22617 _ _ _ _ _ _ _ _
11 1:240 1 = 20 1=400 .0125     5.0     6200.0 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
12 1:300 1 = 25 1=625 .016   10.0     9687.0   968.7 334.8 17339   18.9 18218 340.1 22564 _ _ _ _ _ _ _ _
13 1:360 1 = 30 1=900 .0111   10.0   13950.0 1395 239.0 18475 121.8 18760 236.1 24648 _ _ _ _ _ _ _ _
14 1:480 1 = 40 1=1600 .0125   20.0   24800.0 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
15 1:600 1 = 50 1=2500 .01   25.0   38750.0 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
16 1:720 1 = 60 1=3600 .0111   40.0   55800.0 1395 239.0 18475 121.8 18760 236.1 24648 _ _ _ _ _ _ _ _
17 1:960 1 = 80 1=6400 .0125   80.0   99200.0 1240 266.0 17875   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
18 1:1000 1 = 83 1/3 1=6946.38 .01432 100.0 107669.0 1076.7 302.8 17420   54.2 18162 304.4 22914 _ _ _ _ _ _ _ _
19 1:1200 1 = 100 1=10000 .01 100.0 155000.0 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _

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