in use is held by him. By counting the strokes which occur during a
given period of time, the number of revolutions during that period can
readily be ascertained, and from that the velocity of the current to
be measured can be computed in the usual way.

When the apparatus is submerged in water, by a rope held by the
observer, it will at once adjust itself to the direction of the
current. The force of the current, acting against the wings or blades
of the propeller wheel, puts the latter in revolution, and the tube,
D, will be carried around, and the sliding weight, according to the
position of the tube, will drop toward and bring up against
alternately opposite ends of said tube, making two strokes for every
revolution of the shaft.

[Illustration]

* * * * *




THE FLOWER INDUSTRY OF GRASSE.


A paper on this subject was read before the Chemists' Assistants'
Association on March 8, by Mr. F.W. Warrick, and was listened to with
much interest.

Mr. Warrick first apologized for presenting a paper on such a
frivolous subject to men who had shown themselves such ardent