Articoli correlati a Constructive text-book of practical mathematics Volume...
Sinossi
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. 1912 Excerpt: ...the formula for hi substitute FIG-151. this value of t. In paragraph 1C0, h equals what times sin 60? In the formula substitute this value of h. 7. If no mistake is made in the solution of Problem 6, the final formula reads: /i!=Psin 60---sin 60 4 This may be written (10) 7u=P(sin 60-i sin 60) Copy both the formulas. The expression within the parenthesis means that sin 60" is to be subtracted from sin 60. If the subtraction is performed, the difference is how many times sin 60? In (10) substitute this difference. This problem shows how formula (8) in paragraph 195 is obtained. 8. Look at the figure in Problem 6. The base of one of the small right triangles at the point of the thread equals what part of the pitch? Therefore by the law for hypotenuse Show that this reduces to 9. Copy formula (8) in paragraph 195. Read sin 60 in the table, substitute the reading in the formula, and multiply it by J as indicated. Substitute the result in the formula. Therefore in formula (7).6495 equals what part of the sine of 60? 10. A U. S. standard screw with a pitch of-fa", makes 5 turns to the inch. How is it threaded? What is the depth of the thread? 11. Examine and measure not less than two of the U.S. standard screws at the desk. 12. By reference to paragraph 192, formulate and compute the diameter of the tap drill which must be used in threading the hole for a 2f inch bolt with 4 threads per inch, U. S. standard. 13. By the use of the formulas complete the entries in the following table in which n = number of threads per inch; D = thread diameter; h =depth; d = diameter of drill. 197. The Square Thread. This thread is correctly named for it has a square section, and the point, the width of the groove at top and bottom, the thickness at the root, and the dept...
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