 | Mathematics - 1801 - 658 pages
...the distance of an inaccessible ject on a level. EXAMPLES. I. From the top of a ship's mast, wluch was 80 feet above the water, the angle of depression of another ship's hull, at a distance upon the water, is 20° ; what is their distance ? As radius 90° : tangent of 70* : : AB... | |
 | Samuel Webber - Mathematics - 1808 - 520 pages
...Hr.om.VJI III. From a known height to find the distance of cm i object on a level. EXAMPLES. 1. From the top of a ship's mast, which was 80 feet above...the angle of depression of another ship's hull, at a distance upon the water, is 20° ; what is their distance ? As radius 9O° : tangent of 70° : :... | |
 | John Radford Young - Measurement - 1850 - 294 pages
...feet above the ground: required the height of the steeple from the ground. Ans. 114-1 feet. 6. From the top of a ship's mast, which was 80 feet above...the water, the angle of depression of another ship's hnll was found to be 20°: required the distance between the ships. Ans. 219-8 feet. 7. The uniform... | |
 | Elias Loomis - Trigonometry - 1855 - 192 pages
...length of the base AB by measuring the angle of depression DCA, which is equal to BAC. Ex. 2. From the top of a ship's mast, which was 80 feet above...water, the angle of depression of another ship's hull was found to be 20°. What was its distance ? 99 eal object standing on rto any convenient sta> base-line... | |
 | Elias Loomis - Logarithms - 1859 - 372 pages
...length of the base AB by measuring the angle of depression DCA, which is equal to BAG. Ex. 2. From the top of a ship's mast, which was 80 feet above...water, the angle of depression of another ship's hull was found to be 20°. What was its distance ? SURVEYING. 99 PROBLEM III. (145.) To find the height... | |
 | Edward Butler (A.M.) - 1862 - 154 pages
...OB and OAB are known, will give the distances BA and OA. EXAMPLE V __ From the top of a ship's mast, 80 feet above the water, the angle of depression of another ship's hull is 20° 18' 40". M'hat is the distance between the two ships ? 1.80 ..... ! -9030900 Lcot20° 19',... | |
 | Henry William Jeans - 1873 - 292 pages
...the intervals are 10 seconds and 5 seconds, and observed angle 60°. Ans. Dist. 9889-8 feet. [16]. (Fig. 21'.) From B, the top of a ship's mast, which...water was 20° ; required the distance of the ships. . Aiis. 219-8 feet. * The angle between a horizontal line passing through the eye of the observer and... | |
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From the top of a ship's mast, which was 80 feet above the water, the angle of depression of another ship's hull was found to be 20°. 