Machinists' and Draftsmen's Handbook; Containing Tables, Rules, and Formulas, Intended as a Reference Book for All Interested in Mechanical Work

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ... 33,37 feet. Example 3. A nozzle on a hose is placed at an angle of 38 to the horizontal line and is spouting water a distance of 40 feet in a horizontal direction. What is, theoretically, the velocity of the water when leaving the nozzle? Solution: sin. 2 a ).97O3 Note.--In Example 2 we multiply by sine of 56 degrees, because water is leaving the nozzle at an angle of 28 degrees, and twice 28 equals 56. In Example 3 we multiply by sine of 76 degrees, because twice 38 equals 76. See previous explanations. The greatest possible height will be reached if the body is thrown perpendicularly upward. The greatest possible range is obtained if the body is thrown at an angle of 45 and will then be: b = g At an angle of 45 the horizontal range will be twice the greatest possible height which could have been reached if the tody had been thrown perpendicularly upward. At this angle the horizontal range is four times the neight. For an equal number of degrees over or under 45 decrees the horizontal range will be equal; for instance, if a body is thrown out at an angle of 30 or 60 degrees, the horizontal distance is the same, but the height of ascension will be much more at 60 degrees than at 30 degrees. 11 is frequently useful to notice this in practical work. For instance, water under pressure is thrown the farthest distance in a horizontal direction from a hose when the nozzle is held at an angle of 45 degrees to the horizontal line. It is possible by the same pressure to throw water twice as far in a horizontal distance as in vertical height. Motion Down an Inclined Plane. A ball rolling along an incline, as a c (Fig. 2), will have the same velocity when it gets to c as it would have had if dropping freely from a to b, supposing all friction to be left out of consid...