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. 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 1:192 1/16 = 1 1=256.0 .01562 4.0 3968.0 992 327.3 17343 26.8 18194 332.0 22617 _ _ _ _ _ _ _ _ 2 1:96 1/8   = 1 1=  64.0 .01562 1.0 992.0 992.0 327.3 17343 26.8 18194 332.0 22617 _ _ _ _ _ _ _ _ 3 1:64 3/16 = 1 1=  28.4444 .01406 .4 440.83 1102.2 297.1 17519 59.6 18174 298.8 22994 _ _ _ _ _ _ _ _ 4 1:48 1/4   = 1 1=  16.0 .0125 .2 248.00 1240 266.0 17868 92.6 18356 265.6 23683 _ _ _ _ _ _ _ _ 5 1:32 3/8   = 1 1=    7.1111 .01406 .1 110.22 1102.2 297.1 17519 59.6 18174 298.8 22994 _ _ _ _ _ _ _ _ 6 1:24 1/2   = 1 1=    4.0 .0125 .05 62.00 1240 266.0 17868 92.6 18356 265.6 23683 _ _ _ _ _ _ _ _ 7 1:19.2 5/8   = 1 1=    2.56 .01562 .04 39.68 992 327.3 17343 26.8 18194 332.0 22617 _ _ _ _ _ _ _ _ 8 1:16 3/4   = 1 1=    1.7778 .01406 .025 27.555 1102.2 297.1 17519 59.6 18174 298.8 22994 _ _ _ _ _ _ _ _ 9 1:12 1         = 1 1=    1.0 .01 .01 15.5 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _ 10 1:8 1 1/2   = 1 1=    0.4444 .01575 .007 6.888 984 329.8 17341 24.2 18198 334.7 22602 _ _ _ _ _ _ _ _ 11 1:6 2         = 1 1=    0.25 .01 .0025 3.875 1550 217.6 19221 145.3 19308 212.6 25795 _ _ _ _ _ _ _ _ 12 1:4 3         = 1 1=    0.1111 .0108 .0012 1.722 1435 233.3 18674 128.4 18844 229.5 24941 _ _ _ _ _ _ _ _ 13 1:2 6         = 1 1=    0.0278 .0108 .0003 0.43 1435 233.3 18674 128.4 18844 229.5 24941 _ _ _ _ _ _ _ _ No. In. Ft. Sq. In. Sq. Ft. Sq. In. Sq. Yds. Sq. Ins. Cu. Yds. Cu. Yds. Units ½ mm Units ½ mm Units ½ mm Units ½ mm Units 1 1/16 = 1 1=256.0 1=9.481472 .01265 .12 146.9632 1224.7 268.8 17803 89.4 18321 268.9 23601 _ _ _ _ _ _ _ _ 2 1/8   = 1 1=  64.0 1=2.370370 .01265 .03 36.7407 1224.7 268.8 17803 89.4 18321 268.9 23601 _ _ _ _ _ _ _ _ 3 3/16 = 1 1=  28.4444 1=1.053497 .01519 .016 16.32711 1020.5 318.2 17337 35.8 18194 323.2 22705 _ _ _ _ _ _ _ _ 4 1/4   = 1 1=  16.0 1=0.592592 .0135 .008 9.18514 1148.1 285.4 17584 71.5 18216 287.2 23220 _ _ _ _ _ _ _ _ 5 3/8   = 1 1=    7.1111 1=0.263374 .01519 .004 4.08223 1020.5 318.2 17337 35.8 18194 323.2 22705 _ _ _ _ _ _ _ _ 6 1/2   = 1 1=    4.0 1=0.148148 .0135 .002 2.29629 1148.1 285.4 17584 71.5 18216 287.2 23220 _ _ _ _ _ _ _ _ 7 5/8   = 1 1=    2.56 1=0.094815 .01265 .0012 1.46963 1224.7 268.8 17803 89.4 18321 268.9 23601 _ _ _ _ _ _ _ _ 8 3/4   = 1 1=    1.7778 1=0.065844 .01519 .001 1.02052 1020.5 318.2 17337 35.8 18194 323.2 22705 _ _ _ _ _ _ _ _ 9 1         = 1 1=    1.0 1=0.037037 .0135 .0005 0.57407 1148.1 285.4 17584 71.5 18216 287.2 23220 _ _ _ _ _ _ _ _ 10 1 1/2   = 1 1=    0.4444 1=0.016461 .01458 .00024 0.25511 1063.0 307.0 17434 48.8 18160 309.9 22789 _ _ _ _ _ _ _ _ 11 2         = 1 1=    0.25 1=0.009259 .0108 .0001 0.14351 1435.1 233.3 18674 128.4 18844 229.5 24941 _ _ _ _ _ _ _ _ 12 3         = 1 1=    0.1111 1=0.004115 .01458 .00006 0.06378 1063.0 307.0 17434 48.8 18160 309.9 22789 _ _ _ _ _ _ _ _ 13 6         = 1 1=    0.0278 1=0.001029 .01458 .000015 0.01595 1063.0 307.0 17434 48.8 18160 309.9 22789 _ _ _ _ _ _ _ _ Note.-- Length of section or thickness of wall is always taken as 1 foot. Table can be at once used for vols. in cu. ft. as the No. of sq. ft. in any surface is evidently the same as the No. of cu. ft. when the section is taken as 1 ft. in length.