Rudimentary Treatise On Mensuration Arranged for the Use of Schools And Practi
Rudimentary Treatise On Mensuration Arranged for the Use of Schools And Practi
Baker Thomas Fl.
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MENSURATION OP SOLIDS. 71 FORMULA. S 3= i^^/r, r being the revolving axis, and /the fixed axis. Note. In the prolate spheroid, the revolving axis is the conjugate ; but, in the oblate, the revolving axis is the transverse. EXAMPLES. 1 . Required the solidity of the prolate spheroid A C B D, the axes being A B 50 and C D 30. 30 30 •5236 45000 900 50 26180000 20944 45000 23562-0000 Ans 2. Required the content of an oblate spheroid, the axes of which are 50 and 30 inches. Ans, 22*7257 cubic feet. ...3. What is the solidity of a prolate spheroid, the axes of which are 9 and 7 feet ? Ans. 230*9076 cubic feet. 4. The earth is an oblate spheroid, the equatorial and polar axes being 7925| and 7899 miles respectively ; what is its con- tent in cubic miles ? Problem XVIII. To find the content of the middle zone of a spheroid^ the ends being circular arid perpendicular to the fixed axis. Rule. — To double the square of the middle diameter, add the square of the diameter of one end ; multiply this sum by the length of the frustrum, and the product again by '2618 for the content.
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