We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 15 September 2014
The object of the present communication is to give the purport of the remainder of the letter referred to in the title, as well as that of other letters bearing on the same subject written by the late Mr Froude shortly afterwards, which were not at hand at the time the extract referred to was printed.
page 68 note * These figures give 
. Memoranda of Mr Froude's include weights and measurements afterwards obtained, which show much higher values. Recent measurements of my own of an albatross preserved in spirits at the Museum of Zoology, Cambridge, give 
.
page 69 note * As a justification for this, Mr Froude suggests the circumstance that in the cup anemometer the circumferential speed of the cups is accounted to be ⅓ the speed of the wind ; hence the relative speed of the wind facing the concave surfaces is only one-half that facing the convex surfaces, yet the wind presumably exerts the same force on both.
