When The Plane Of The Beam Or Bar Projects Obliquely Upward Or Downward
Description
This section is from the book "The English And American Mechanic", by B. Frank Van Cleve. Also available from Amazon: The English And American Mechanic.
When The Plane Of The Beam Or Bar Projects Obliquely Upward Or Downward
When Fixed At One End And Loaded At The Other. Rule
Multiply the value of the material by the breadth and square of the depth in inches, and divide the product by the product of the length in feet and the cosine of the angle of elevation or depression.
Note
When the weight is laid uniformly along its length, the result must be doubled.
Example
What is the weight an ash-beam, 5 feet in length, 3 lns. square, and projecting upward at an angle of 7° 15', will bear without permanent injury ?
55X3X3²=1485, whlch, / 5x cos. 7° 15',=1485 / 5X.992=290.39 lbs.
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