[ 154 ] 
quantity of cloth were greateft, that the fecond term- 
of the ratio was lefs. 
f • n » * " * * . '•* Ml..,. 
IV. Concerning the effects of fails , according to 
the different velocity of the wind. 
Maxim i. The velocity of windmill fails , whe- 
ther unloaded , or loaded Jo as to -produce a maximum , 
is nearly as the velocity of the wind , their fiape 
and peftion being the J'ame. 
This appears by comparing together the refpe&ive 
numbers of columns 4 and 5, tab. IV. wherein thofe 
of numbers 2, 4, and 6, ought to be double of num- 
bers 1, 3, and y : but as the deviation is no- where 
greater than what may be imputed to the inaccuracy 
of the experiments the mle Ives, and hold good exact- 
ly in numbers 3 and 4 ; which lefts were deduced 
from the medium of a number of experiments, care- 
fully repeated the fame day, and on that account are 
molt to be depended upon j we may therefore con- 
clude the maxim true. 
Maxim 2. The load at the maximum is nearly^ 
but fomewhat lefs than , as the / quare of the velocity 
cj the windy the fiape and poftion of the fails be- 
ing the J'ame. 
This appears by comparing together the numbers 
in col. 6. tab. IV. wherein thofe of numbers a, 4, 
and 6 (as the velocity is double), ought to be qua- 
druple of thofe of numbers 1, 3, and 5 j inftead of 
which they fall fhort, number 2 by fj, number 4 
by tVj an d number 6 by part of the whole. 
The greateft of thofe deviations is not more confi- 
derable than might be imputed to the unavoidable 
errors 
