Changes made

Several obvious typographical and punctuation errors have been corrected silently. Ditto characters have in several cases been replaced by the dittoed text. Footnotes have been moved to directly under the paragraph to which they belong. Some tables and mathematical formulas have been re-arranged or re-aligned for better readability. page 374: (.3-inch changed to (3 inch) page 375: 935,649,235 pounds changed to 935, 649, and 235 pounds; caliber 10,236 inches changed to caliber 10.236 inches