Irrigation Manual
EXPLANATION OFTABLE OFTANGENTS A COTANGa#39;S.P U8 I. Required the tangent of the angle 65Ad 20a#39; f In the first column of degrees find 65, then pass horizontally across to thecolumn headed 20a#39; where find 2.17749 as the tang, required.
| Title | : | Irrigation Manual |
| Author | : | Walter P. Butler |
| Publisher | : | - 1892 |
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