Obvious punctuation and spelling errors and inconsistent hyphenation have been corrected.

Page numbers for blank pages and pages consisting entirely of illustration are not visible.

The oe and Æ ligatures in the text have been left as they appear in the original book. If they do not display properly, you may have an incompatible browser or unavailable fonts. Make sure that the browser's "character set" or "file encoding" is set to Unicode (UTF-8). You may also need to change your browser's default font.

The fractions ¼, ½ and ¾ are represented using single characters, but other fractions use the / and - symbols, e.g. 3/8 or 2-5/8.

The skin friction formulÆ given on pages 11 and 128 have been corrected by comparison with other sources. Respectively, the formulÆ were originally printed as

f = 0·00000778l^9·3v^1·85
and
f = 0·00000778l - ^00·7v^1·85

The remaining corrections made are indicated by red dotted lines under the corrections. Scroll the mouse over the word and the original text will be displayed.

In ambiguous cases, the text has been left as it appears in the original book.