116 A NEW SELF-REGISTERING ANEMOMETER, ETC. 
measured when the paper is changed, i.e. once a day. I have 
already spoken of the ease with which the direction-parts work, | 
and may add that the cups which are, as just stated, 75 feet above 
the ground, will go on recording one or two miles per hour, when 
there is perfect calm on the ground and amongst the trees 20 or 
the number of miles recorded. 
e design for this instrument includes a record of the pressure 
of the wind, and also an electric pen which, under a signal from 
the standard clock, will record on the paper each hour as a check 
made one complete turn backwards, but several times the vane 
has “hacked” 90°, and once or twice 180°, but in 120 days it has 
turned in the normal direction 12} times, or once in ten days. 
