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Livres Livres 1 - 2 sur 2 pour I meafured from its bottom a diftance of 40 feet, and then took the angle formed....
" I meafured from its bottom a diftance of 40 feet, and then took the angle formed by the plane and a line drawn to the top 41"; and going 'on in the fame... "
An introduction to plain trigonometry, with its application to heights and ... - Page 82
de Richard Cockrel - 1792 - 99 pages
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A Treatise on Mensuration, Both in Theory and Practice

Charles Hutton - 1788 - 703 pages
...declivity, I meafured from its bottom a diftance of 40 feet, and then took the angle formed by the plane and a line drawn to the top 41"; and going 'on in the fame direftion 60 feet farther, the fame angle was 23* 45', the height of the inftrument being five feet...
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Mathematics: Compiled from the Best Authors and Intended to be the ..., Volume 2

1801 - 426 pages
...declivity, I measured from its bottom a distance of 40 feet, and then took the angle formed by the plane and a line drawn to the top, 41° > and going on in the same direction 60 feet further, I found the same angle to be 23° 45', the height of the instrument...
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