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Areas           MAP AND SURVEY SCALES          No. 4
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
No. Ins. Ins. Ins. Miles Sq. In. Acres Sq. In. Acres Acres Units ½ mm Units ½ mm Units ½ mm Units ½ mm Units
  1 1:120 120    = 1 1=    .0444 .01575   .0007         .6888   984 329.8 17341   24.2 18198 334.7 22602 _ _ _ _ _ _ _ _
  2 1:792   80    = 1 1=    .10 .01   .001       1.55 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  3 1:1056   60    = 1 1=    .1777 .01406   .0025       2.7555 1102.2 297.1 17519   59.6 18174 298.8 22994 _ _ _ _ _ _ _ _
  4 1:1584   40    = 1 1=    .40 .0125   .005       6.20 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
  5 1:1980   32    = 1 1=    .625 .016   .01       9.687   968.7 334.8 17339   18.9 18218 340.1 22564 _ _ _ _ _ _ _ _
  6 1:3168   20    = 1 1=  1.6 .0125   .02     24.80 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
  7 1:3960   16    = 1 1=  2.5 .01   .025     38.75 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
  8 1:5280   12    = 1 1=  4.444 .01575   .07     68.8888   984 329.8 17341   24.2 18198 334.7 22602 _ _ _ _ _ _ _ _
  9 1:6336   10    = 1 1=  6.4 .0125   .08     99.2 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
10 1:7920     8    = 1 1=10.0 .01   .10   155.0 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
11 1:10560     6    = 1 1=17.777 .01406   .25   275.55 1102.2 297.1 17519   59.6 18174 298.8 22994 _ _ _ _ _ _ _ _
12 1:12672     5    = 1 1=25.0 .01562   .40   396.8   992 327.3 17343   26.8 18194 332.0 22617 _ _ _ _ _ _ _ _
13 1:15840     4    = 1 1=40.0 .01   .40   620.0 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
14 1:21120     3    = 1 1=71.11111 .01406 1.0 1102.22 1102.2 297.1 17519   59.6 18174 298.8 22994 _ _ _ _ _ _ _ _
15 1:25344     2½ = 1 1=    .16 Sq. M. .0125   .002     2.48 Sq. M. 1240 266.0 17868   92.6 18356 265.6 23683 _ _ _ _ _ _ _ _
16 1:12672     5    = 1 1=    .04    " .01   .0004       .62    " 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _
17 1:6336   10    = 1 1=    .01    " .01   .0001       .155  " 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _

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