All scale values in illustration captions retained. The value may not be visually correct.
All fractions regularised to numerator/denominator.
Page 3, ‘Reaumur’s’ changed to ‘Réaumur’s,’ “Réaumur’s scale”
Page 9, closing single quote changed to double quote.
Page 12, full stop appended to illustration caption, “Scale about 1/20.”
Page 16, full stop appended to illustration caption, “9.”
Page 17, semicolon changed to full stop, “...it has never been frozen.”
Page 23, first footnote changed from “8 R = 18 F.” to “8 R = 50 F.”
Page 27, ‘vice versâ’ changed to ‘vice versa,’ “...proportion, and vice versa,...”
Page 30, dash changed to space, “29·500 inches.”