6^ 



That is, the square of the diameter of the base of the cone, multi- 

 plied by its height, divided by 9, and the square root extracted, 

 will give the diameter of the cylinder ; or in other words, of the 

 rim of the funnel placed on the inverted base of the cone, into 

 which a fall of three inches of rain shall fill the cone. 



Here D=6; H=18,642; then, according to die formula, the 

 square of 6=36 multiplied by 1S,642, the product divided by 9, 

 and the square root of the quotient extracted will give the answer, 

 that is 36X18,642=671 ,112 ; this divided by 9 gives 74,568, the 

 square root of which 8.63 inches will then be the diameter of the 

 rim of the funnel. 



The cube roots of the 30 numbers and their products, multiplied 

 by 6, are as follows: 1 



According to these numbers, the scale is then graduated. 



F rom the construction of this gage, it is evident that the oftener 

 its contents, after being measured and registered, are discharged, 

 the more correct will be the account, and that the facility with 

 which this can be done, is much greater than that which is allow- 



July 2. The curators reported the receipt of the following 

 donations since the last meeting :— From John Bulkley, Pe- 

 ter M'Kelvey and Ambrose S. Townsend, copper coins ; from 

 John Gott, orthoceratite, from St. Lawrence county ; from 

 Robert Yates, three specimens of the sea horse ; from Isaac 

 Lea, of Philadelphia, fibrolite, from Wilmington, (Delaware) ; 

 from John B. Beck, of New-York, 12 London Almanacs of 

 the year 1637, bound in one volume; from George W. Clin- 



