Transcriber's Notes:
All obvious typographical errors were corrected. Tables containing decimal fractions were standardized to show decimals for all values in the column. Spelling was standardized to the most prevalent form. Punctuation was left as printed.
On page 42 the curve value 31/2° was changed to 3° 30' to match the other similar values. The sum of the shares in the table in Appendix A on pages 50-51 should total 4,610 shares but was printed as 0,000. This was assumed to be a typographical error.