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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.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 187