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TABLE OF ZENITH-TANGENTS Height of Opposite Building Above Bottom of Prism Plate, Feet. * 3 4 5 6 8 10 12 15 17 20 25 30 35 3 1.00 .75 .60 .50 .37 .30 .25 .20 .18 .15 .12 .10 .08 4 1.33 1.00 .80 .66 .50 .40 .33 .26 .24 .20 .16 .13 .11 5 1.66 1.25 1.00 .83 .62 .50 .42 .33 .29 .25 .20 .16 .14 6 2.00 1.50 1.20 1.00 .75 .60 .50 .40 .35 .30 .24 .20 .17 8 2.66 2.00 1.60 1.33 1.00 .80 .66 .53 .47 .40 .32 .26 .23 10 3.33 2.50 2.00 1.66 1.25 1.00 .83 .66 .59 .50 .40 .33 .29 12 4.00 3.00 2.40 2.00 1.50 1.20 1.00 .80 .71 .60 .48 .40 .34 15 5.00 3.75 3.00 2.50 1.87 1.50 1.25 1.00 .88 .75 .60 .50 .43 17 5.66 4.25 3.40 2.83 2.12 1.70 1.42 1.13 1.00 .85 .68 .57 .49 20 6.66 5.00 4.00 3.33 2.50 2.00 1.66 1.33 1.18 1.00 .80 .66 .57 25 8.33 6.25 5.00 4.16 3.12 2.50 2.08 1.66 1.47 1.25 1.00 .83 .71 30 10.00 7.50 6.00 5.00 3.75 3.00 2.50 2.00 1.76 1.50 1.20 1.00 .86 35 11.66 8.75 7.00 5.83 4.37 3.50 2.92 2.33 2.06 1.75 1.40 1.16 1.00 40 13.33 10.00 8.00 6.66 5.00 4.00 3.33 2.66 2.35 2.00 1.60 1.33 1.14 45 15.00 11.25 9.00 7.50 5.62 4.50 3.75 3.00 2.71 2.25 1.80 1.50 1.29 50 16.66 12.50 10.00 8.33 6.25 5.00 4.16 3.33 2.95 2.50 2.00 1.66 1.43 55 18.33 13.75 11.00 9.16 6.87 5.50 4.58 3.66 3.24 2.75 2.20 1.83 1.57 60 20.00 15.00 12.00 10.00 7.50 6.00 5.00 4.00 3.53 3.00 2.40 2.00 1.71 65 21.66 16.25 13.00 10.83 8.12 6.50 5.42 4.33 3.83 3.25 2.60 2.16 1.86 70 23.33 17.50 14.00 11.66 8.75 7.00 5.83 4.66 4.12 3.50 2.80 2.33 2.00 80 26.66 20.00 16.00 13.33 10.00 8.00 6.66 5.33 4.71 4.00 3.20 2.66 2.28 90 30.00 22.50 18.00 15.00 11.25 9.00 7.50 6.00 5.30 4.50 3.60 3.00 2.57 100 33.33 25.00 20.00 16.66 12.50 10.00 8.33 6.66 5.87 5.00 4.00 3.33 2.86 125 41.66 31.25 25.00 20.83 15.62 12.50 10.42 8.33 7.35 6.25 5.00 4.16 3.57 150 50.00 37.50 30.00 25.00 16.25 15.00 12.50 10.00 8.82 7.50 6.00 5.00 4.29 175 58.33 43.75 35.00 29.16 21.87 17.50 14.58 11.66 10.29 8.75 7.00 5.83 5.00 200 66.66 50.00 40.00 33.33 25.00 20.00 16.66 13.33 11.76 10.00 8.00 6.66 5.71 * Distance from Prism Plate to Face of Opposite Building, Feet.