Of the Excellent Qualities of Coffee. 637 



amounts to 1.1945 cubic inches; consequently a cylin- 

 drical vessel (which I shall call the strainer) proper for 

 making one cup of coffee must be of such diameter that 

 1. 1 945 cubic inches of ground coffee will fill it to the 

 height of two thirds of an inch. 



On making the computation, it will be found that 

 one inch and a half is the most proper diameter for 

 the strainer to be employed in making one single cup 

 of good coffee. And as the thickness of the stratum 

 of ground coffee must always be the same, whatever 

 may be the number of cups that are made at the same 

 time, the diameter of strainers of different sizes will be 

 as follows, viz. : — 



Inches. 



For I cup 1.5 



2 2.1213 



3 2.5986 



4 3 



5 3-3541 



6 36742 



7 3-9687 



8 4.2426 



9 4-5 



10 47434 



11 4-9749 



and for 12 5.1962 



For common use the following sizes will answer 

 very well ; and, in order that workmen may not have 

 the trouble of computing the heights of the cylindrical 

 vessels which I have called strainers, which contain 

 the water that is poured on the ground coffee, I have 

 given these heights in the following table. They have 

 been determined on the supposition that the diameter 

 of the vessel is always just equal to the diameter of the 

 perforated bottom by which it is closed below, and that 



